Step 1: Bake the Cake Layers

1. Preheat your oven to 350°F (175°C). Grease and flour three 8-inch round cake pans.
2. In a medium bowl, whisk together the flour, baking powder, and salt.
3. In a large bowl, beat the butter and sugar until fluffy. Add the eggs one at a time, followed by the vanilla extract.
4. Alternate adding the dry ingredients and milk, beginning and ending with the dry ingredients. Mix until smooth.
5. Divide the batter evenly among the prepared pans. Bake for 20–25 minutes or until a toothpick inserted in the center comes out clean. Cool completely.

Step 2: Prepare the Cookie Dough Filling

1. Heat-treat the flour by spreading it on a baking sheet and baking at 350°F (175°C) for 5 minutes. Let it cool completely.
2. In a bowl, cream the butter and brown sugar until fluffy. Mix in the vanilla, flour, and milk until smooth. Fold in the mini chocolate chips.

Step 3: Make the Frosting

1. Beat the butter until creamy. Gradually add powdered sugar, alternating with heavy cream, until the frosting is fluffy and smooth. Stir in vanilla extract and salt.

Step 4: Assemble the Cake

1. Place one cake layer on a serving plate. Spread a layer of cookie dough filling on top.
2. Repeat with the second layer. Place the third cake layer on top.
3. Frost the entire cake with the buttercream frosting. Decorate with extra cookie dough balls and mini chocolate chips if desired.