- 1 (18.25 ounce) package yellow cake mix
- 1 cup peanut butter
- 2 eggs
- 2 2/3 tablespoons softened butter
- 1 (15 ounce) container coconut-pecan cake frosting
- 1 (14 ounce) can sweetened condensed milk (such as Eagle Brand®)
- 1 (12 ounce) bag chocolate chips (such as Nestle®)
- 2 teaspoons softened butter
- Preheat oven to 350 degrees F (175 degrees C). Grease a 9×5-inch loaf pan.
- Beat cake mix, peanut butter, eggs, and 2 2/3 tablespoons softened butter together in a large bowl until you have a smooth batter. Spread about 2/3 of the batter into the prepared baking dish; press remainder into small balls and set aside.
- Stir frosting, sweetened condensed milk, chocolate chips, and 2 teaspoons softened butter together in a bowl until smooth; spread atop the layer of batter in the baking dish. Lightly flatten balls of batter with your fingers and spread atop the frosting mixture.
- Bake in preheated oven until golden brown, 20 to 25 minutes. Cool completely before cutting into 24 squares to serve.