1-First Step: Preheat your oven to 350°F (175°C) and line a 9×13 inch baking pan with parchment paper, leaving some overhang for easy removal later. This preparation step ensures your buckeye brownies will release cleanly from the pan and makes cutting them much easier.

2-Second Step: In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, and salt until well combined. In a separate bowl, beat the eggs lightly, then add the melted butter and vanilla extract, mixing thoroughly. Pour the wet ingredients into the dry ingredients and stir until just combined. Fold in the chocolate chips last.

3-Third Step: Spread the brownie batter evenly into your prepared pan using an offset spatula or the back of a spoon. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with just a few moist crumbs. Avoid overbaking, as this will result in dry brownies rather than the fudgy texture we’re aiming for. Let the brownies cool completely in the pan.

4-Fourth Step: While the brownies cool, prepare the peanut butter layer. In a medium bowl, beat the softened butter and peanut butter together until smooth and creamy. Gradually add the powdered sugar, one cup at a time, mixing well after each addition. Add the vanilla extract and milk, adjusting the amount of liquid until you reach a smooth, spreadable consistency.

5-Fifth Step: Once the brownies are completely cool, spread the peanut butter mixture evenly over the top. Start from the center and work your way to the edges, maintaining an even layer. For the best results, let this layer chill in the refrigerator for 30-45 minutes to set before adding the chocolate topping.

6-Sixth Step: Prepare the chocolate topping by melting the chocolate chips and butter together. You can do this in the microwave in 30-second intervals, stirring between each, or using a double boiler on the stovetop. Stir until completely smooth and glossy, then let it cool for 2-3 minutes so it’s not hot to the touch.

7-Seventh Step: Pour the melted chocolate over the chilled peanut butter layer. Spread it evenly using an offset spatula, working quickly before the chocolate sets. If desired, create decorative swirls with a fork for a professional-looking finish.

8-Final Step: Chill the completed buckeye brownies in the refrigerator for at least 1 hour to set all layers completely. Once set, remove from the pan using the parchment paper overhang. Use a sharp knife to cut into 24 squares, wiping the knife clean between cuts for neat edges. For even better cutting results, run the knife under hot water and dry it before each cut. Serve these delicious buckeye brownies at room temperature for the best texture and flavor experience.