Ingredients

3¾cupsall-purpose flour,sifted, spoon and leveled

¾tspbaking powder

¾tspBaking Soda

1tspsalt

1½cupsunsalted butter,(3 sticks), softened to room temperature

2cupsgranulated sugar

3large eggs,room temperature

4large egg yolks,room temperature

3tsppure vanilla extract

1½cupsbuttermilk,room temperature

1cupunsalted butter,softened to room temperature

4½cupsconfectioners’ sugar

¾cupnatural unsweetened,Dutch-process cocoa powder

½cupwhole milk

1tbsplight corn syrup

1½tsppure vanilla extract

⅛tspsalt

2cupsassorted candies,such as M&Ms, chocolate chips, sprinkles, gummy bears, jelly beans, candy corns, chopped candy bars, mini Reese̱s cups etc.

additional sprinkles or candies,for decorating the cake, optional

Preparation

Preheat oven to 350 degrees F. Grease and lightly flour 4 9-inch cake pans (or four 8-inch cake pans but the bake time will be slightly longer).

Whisk the flour, baking powder, baking soda, and salt together in a large bowl. Set aside.

Using a handheld or stand mixer fitted with a paddle attachment, beat the butter on high speed for about 1 minute until smooth and creamy. Add the sugar and beat on high speed for about 5 minutes until creamed together fairly well. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed.

At medium-high speed, add 1 whole egg at a time, beating well after each addition until all 3 whole eggs are mixed in. Then, repeat with each egg yolk until all 4 egg yolks are mixed in. Beat in the vanilla extract. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed.

With the mixer on low speed, add the dry ingredients in three additions alternating with the buttermilk, beginning and ending with the dry ingredients, and mixing each addition just until incorporated; do not overmix this batter. The batter will be smooth, velvety, and slightly thick. Spoon/pour batter evenly into each cake pan.

Bake for about 25 minutes or until the cakes are baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, it is done. Allow cakes to cool completely in the pans set on a wire rack. The cakes must be completely cool before frosting and assembling.

Using a handheld or stand mixer fitted with a paddle attachment, beat the butter at high speed for about about 2 minutes until pale, smooth, and creamy.

Using a fine mesh strainer or sieve, sift the confectioners’ sugar and cocoa together. Add the sugar/cocoa mixture to the butter, then beat on low speed for about 20 seconds. Stop the mixer, then add the milk, corn syrup, vanilla, and salt. Beat on medium-high speed for about 2 minutes. If the frosting is too thick, beat in an extra splash of milk.

Grab a 3½- to 4-inch circle cookie cutter and cut a hole into two of the cake layers. Alternatively, cut a piece of parchment paper that size and use a sharp knife to trace/cut the holes.

Place one of the whole cakes on a cake stand or serving plate. Use an offset spatula or knife to frost the top of the cake, then place one of the cut/holed cakes on top. Frost the top and inside the cavity.

Place the other cut/holed cake on top and, once again, frost the top and inside the cavity. Fill the cavity with candies all the way up to the top. Place the last whole cake on top and frost the top and sides of the entire cake.

Decorate with frosting and any dditional candies. Use1M tip to pipe frosting around the top. Slice, serve, and enjoy!