Make the Hot Fudge Sauce

• In a medium saucepan over medium heat, combine the heavy whipping cream, corn syrup, sugar, salt, butter, and vanilla. Whisk constantly until the butter is fully melted and the mixture begins to simmer.
• Reduce heat to medium-low and add the chocolate chips. Stir until melted.
• Whisk in the cocoa powder and continue to cook on low until fully incorporated and glossy, about 1 minute.
• Place the hot fudge into an airtight container and store in the refrigerator until room temperature, 20-30 minutes. It will thicken significantly as it cools.

Prepare the Graham Cracker Crust

• In a small bowl, combine the graham cracker crumbs and granulated sugar, then pour in the melted butter. Mix well until all the ingredients are fully combined. Place a 6-inch cardboard cake circle into the bottom of a 6-inch springform pan, then use a glass jar or cup to press the graham cracker crust evenly on top of the cardboard cake circle and into the sides of the pan. Refrigerate the crust in the springform pan until you're ready to assemble the ice cream cake.

Make the S'mores Ice Cream Layers

• Wait to make the ice cream layers until right before you're ready to assemble the cake. Place a large metal or glass bowl into the refrigerator for at least 20 minutes to chill before you get started.
• Melt the semi-sweet chocolate chips in the microwave in 20-second intervals, stirring after each one until the chocolate chips are fully melted. Allow to cool completely to room temperature, about 15-20 minutes.
• Add the heavy whipping cream and 2 teaspoons of the vanilla extract into the chilled bowl, then whip it with a hand mixer on high speed until stiff peaks form, 3-4 minutes. You can alternatively use a stand mixer with the whisk attachment for this part. Place the whipped cream into the refrigerator while you move on to the next step.
• Divide the sweetened condensed milk evenly between two medium bowls. To one bowl, whisk in the melted and cooled semi-sweet chocolate. To the second bowl, whisk in the marshmallow fluff.
• Divide the whipping cream evenly between the two bowls you created in the previous step. Fold each sweetened condensed milk mixture together with the divided whipped cream to create chocolate ice cream and marshmallow ice cream. Fold the toasted mini marshmallows into the marshmallow ice cream mixture.

Assembly

• Un-latch the springform pan and place a sheet of acetate between the outer edge of the graham cracker crust and the inside of the pan. Re-latch the springform pan and tape the acetate together once it's the same diameter as the pie crust. Here are more detailed instructions on how to prepare the acetate collar.
• Reserve about 1/3 Cup of hot fudge sauce for the decorative drip, then pour the rest onto the graham cracker crust. Smooth with a rubber spatula to create an even layer. Add the chocolate ice cream on top of the hot fudge layer and smooth with a rubber spatula.
• Add about 1/3 Cup of the crumbled graham crackers on top of the chocolate ice cream before adding the marshmallow ice cream on top and smoothing it down with a rubber spatula.
• Freeze the s'mores ice cream cake for at least 6 hours. When you're ready to serve it, remove the cake from the springform pan and unwrap the acetate. Re-heat the hot fudge sauce in the microwave in 10-second intervals until it reaches room temperature, then use it to create a decorative half drip around the top edge of the cake. Garnish with more graham cracker crumbs and toasted mini marshmallows.

• Place a large metal or glass bowl into the refrigerator for at least 20 minutes to chill before you get started.
• Toast the Marshmallows: Line a baking sheet with aluminum foil and coat it with baking spray before adding the mini marshmallows in a single layer. Use a butane torch to toast the mini marshmallows. Alternatively you can toast the marshmallows under the broiler in your oven. If you do, watch them closely to make sure they don't burn. Set the toasted marshmallows aside to cool completely.
• Prepare the Graham Crackers: Use a food processor to finely crush half of the graham crackers (4 1/2 whole graham crackers or 9 squares). Set aside. Crumble the remaining graham crackers by hand into bite sized pieces and set aside.
• Add the heavy whipping cream into the chilled bowl, then whip it with a hand mixer on high speed until stiff peaks form, 2-3 minutes. You can alternatively use a stand mixer with the whisk attachment for this part.
• In a separate small bowl, whisk together the sweetened condensed milk, vanilla extract, and finely crushed graham crackers. Gently fold the sweetened condensed milk mixture into the heavy whipping cream with a rubber spatula. Reserve about 1/8 Cup of toasted marshmallows and about 1/8 Cup of crumbled graham crackers, then fold the rest of the toasted marshmallows and crumbled graham crackers into the ice cream mixture.
• Pour half of the ice cream mixture into a 9x5x3 inch metal loaf pan. Add half of the hot fudge sauce and use a butter knife to swirl it around. Drop the marshmallow creme by the spoonful, 1-2 inches apart, on top of the fudge swirl. Add the rest of the graham cracker ice cream mixture on top.
• Add the remaining hot fudge sauce on top and use a butter knife to swirl it around. Add the reserved crumbled graham crackers and toasted marshmallows, then cover with aluminum foil and freeze until solid and scoopable, 5-6 hours.

Make The Graham Cracker Crust

• In a small bowl, stir together the graham cracker crumbs and granulated sugar. Add the melted butter and mix until well incorporated.

Make The Graham Cracker Cupcakes

• Preheat the oven to 350˚F and line a muffin pan or cupcake pan with liners. Press a spoonful of the Graham Cracker Crust into the bottom of each cupcake liner.
• In a medium sized bowl, add the graham cracker crumbs, sifted cake flour, baking powder, baking soda, and salt. Whisk to combine and set aside.
• In the bowl of a stand mixer with the paddle attachment, cream butter for one minute on high. Scrape down the bowl and paddle and add the sugar. Cream together on high for two minutes, scraping down the bowl and paddle once in between. Turn the mixer to low and add the egg and egg yolk until combined.
• Add vanilla and mix on medium for one minute. Turn the mixer to low and add all of the dry ingredients at once until just combined, then add the milk all at once. Scrape down the bowl and paddle once more and mix on low for about 30 seconds. Do not overmix.  
• Pour batter on top of the graham cracker crust bottomed liners to fill no more than ⅔ full. Bake for 17 minutes or until a toothpick inserted comes out clean. Cool completely before filling or frosting.

Make The Chocolate Buttercream

• In a stand mixer fitted with a paddle attachment, whip butter on medium speed until creamy and light in color, about four minutes. Scrape down the bowl and paddle and turn the mixer to low, then add powdered sugar, cocoa powder, milk, salt, and vanilla extract. Increase the speed to medium and beat for one full minute.

Make The Marshmallow Meringue

• Whisk the egg whites, sugar, and cream of tartar together in a small heatproof bowl. Set the bowl over a saucepan filled with an inch or two of simmering water, making sure the bottom of the bowl doesn’t touch the water (or else it will cook your eggs!). Whisk the mixture constantly until the sugar has dissolved, about 4 minutes.
• Once the sugar has dissolved, pour the mixture into the bowl of your stand mixer fitted with the whisk attachment. Add the vanilla and whisk the mixture on high for 6 full minutes, until stiff peaks form. You should be able to dip the whisk into the meringue and it forms a peak that maintains its shape when turned right side up and upside down.

Assembly

• Once the Graham Cracker Cupcakes are cooled, cut out the centers using a knife or inverted large piping tip. Fill the empty centers with Marshmallow Fluff. Fit a piping bag with Wilton tip 1M and fill it with Chocolate Buttercream, then pipe a swirl of chocolate buttercream on top of each cupcake. Sprinkle with graham cracker crumbs.
• To get the look pictured, fit one piping bag with Wilton Tip 1M and another with Wilton Tip 4B. Fill both piping bags with Marshmallow Meringue. Pipe a small swirl with Wilton Tip 1M on top of each cupcake, then pipe two stars next to each small meringue swirl with Wilton Tip 4B. Toast the meringue accents (carefully!) with a culinary torch.

Make The Graham Cracker Cake

• Preheat the oven to 350˚F and prepare three 8-inch or four 6-inch cake pans by spraying the sides with cooking spray and fitting a parchment or wax paper circle to the bottom of each pan. 
• Grind the graham crackers into a crumbs by either using a food processor or placing them into a large ziplock back and crushing them with a rolling pin. Place the graham cracker crumbs into a medium sized bowl and add the sifted cake flour, baking powder, baking soda, and salt. Whisk to combine and set aside. 
• In the bowl of a stand mixer with the paddle attachment, cream butter for one minute on high. Scrape down the bowl and paddle and add the sugar. Cream together on high for two minutes, scraping down bowl and paddle once in between. Turn mixer to low and add the eggs, one at a time, scraping down bowl and paddle as necessary. Once all eggs are added, turn the mixer to high and beat for three minutes. 
• Add vanilla and sour cream and continue mixing for one minute. Turn the mixer to low and add all of the dry ingredients at once until just combined, then add the milk all at once. Scrape down the bowl and paddle once more and mix on low for about 30 seconds. Do not overmix.

  Pour batter into prepared pans (about ⅔ full). 
• Bake for 35-45 minutes or until a toothpick inserted into the center comes out clean. Cool the cakes for five minutes before releasing from the pan and continuing to cool on a baking sheet or wire rack.

Make The Milk Chocolate Ganache

• Place chocolate chips in a heatproof bowl. In a saucepan over medium-high heat, whisk heavy whipping cream constantly until you start to see the beginnings of a boil. Just before it begins to form a rolling boil, remove the cream from the heat and pour over chocolate chips. Let the mixture sit for about 30 seconds, then whisk it all together until smooth and uniform in consistency. Cool the ganache on the counter until it reaches room temperature before using in/on the cake.  

Make The Toasted Marshmallow Buttercream

• Line a baking sheet with aluminum foil and lightly spray the surface of the foil with cooking spray. Place your marshmallows on the foil and set in the center rack of the oven. Broil the marshmallows on high until they start to brown on top (watch them closely!), then flip them over so they can brown on the bottom as well. When both sides are toasted, take them out of the oven to cool.
• In a stand mixer with the paddle attachment, whip the butter on medium until creamy and light in color, about 5 minutes. Add the powdered sugar and continue mixing on low for another 2 minutes, scraping down the bowl and paddle afterwards. Add the vanilla and beat on medium for 3 minutes, then add the marshmallow fluff, roasted marshmallows, and salt. Continue mixing on medium for another minute.

Make The Vanilla Buttercream

• In a stand mixer with the paddle attachment, beat butter on high for until it’s fluffy and almost white in color, about 7 minutes, scraping down the bowl and paddle a few times during the process. Add the powdered sugar a few cups at a time and mix on medium until incorporated. Scrape down the bowl and paddle before each addition. Turn the mixer to low and add the vanilla extract, milk, and salt. Beat on medium for another minute until well incorporated, scraping down the bowl and paddle as needed.

Make The Marshmallow Meringue

• Whisk the egg whites, sugar, and cream of tartar together in a small heatproof bowl. Set the bowl over a saucepan filled with an inch or two of simmering water, making sure the bottom of the bowl doesn’t touch the water (or else it will cook your eggs!). Whisk the mixture constantly until the sugar has dissolved, about 4 minutes. 
• Once the sugar has dissolved, pour the mixture into the bowl of your stand mixer fitted with the whisk attachment. Add the vanilla and whisk the mixture on high for 6 full minutes, until stiff peaks form. You should be able to dip the whisk into the meringue and it forms a peak that maintains its shape when turned right side up and upside down. 

Assembly

• Torte each layer of graham cracker cake to desired height. Pipe a circle of vanilla buttercream around the edge of the first layer to act as a buttercream dam. Fill the center of the circle with half chocolate ganache (room temperature or colder), and half toasted marshmallow buttercream. Place the next layer of graham cracker cake on top and repeat the filling process before placing the third layer on top.
• Crumb coat the cake with vanilla buttercream and place it into the refrigerator for 15 minutes before topping with a final coat of vanilla buttercream. Garnish the cake with a chocolate ganache drip, graham cracker crumbs, and marshmallow meringue piping that’s been toasted with a culinary torch. Or decorate however your heart desires.