Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease a 9x13-inch baking dish with baking spray or butter.

Step 2

In a large bowl, add the brownie mix, oil, eggs, and water. Mix until smooth and well-combined. Pour the batter into the greased baking dish.

Step 3

Bake the batter for 28 to 31 minutes, or until the edges of the brownies start to pull away from the sides of the pan.

Step 4

Meanwhile, prepare the peanut butter filling. In a large bowl, add the powdered sugar, peanut butter, and 1/2 cup softened butter. Beat at medium speed until the mixture is smooth and creamy.

Step 5

Spread the filling over the warm brownies.

Step 6

Prepare the chocolate layer. Place the chocolate chips and 6 tablespoons softened butter in a saucepan over low heat. Stir constantly until melted, about 5 minutes. Spread the chocolate mixture over peanut butter filling.

Step 7

Let the buckeye brownies cool completely in the fridge before cutting into squares. Enjoy!