1-Preheat the oven to 350°F (175°C). Line an 11 x 13-inch metal or glass baking pan with parchment paper. This prevents sticking and eases cleanup.

2-Mix wet base: In a large bowl, thoroughly combine 1 cup peanut butter, ⅔ cup melted unsalted butter, 1⅓ cups granulated sugar, and 1 cup light brown sugar.

3-Add eggs and flavor: Gradually mix in 4 large eggs, 2 teaspoons vanilla extract, and ¼ teaspoon salt until smooth.

4-Prepare dry ingredients: In a separate bowl, whisk 2 cups all-purpose flour and 2 teaspoons baking powder.

5-Fold gently: Slowly incorporate dry mix into wet without overmixing. This keeps the batter chewy.

6-Spread and top: Evenly spread batter in the pan. Sprinkle ½ cup Reese’s Pieces on top. They melt slightly to adhere perfectly.

7-Bake: 30 to 35 minutes, until top feels firm but center stays moist. Toothpick test: few moist crumbs ideal.

8-Cool: Rest 30 minutes in pan before cutting. Patience pays off for clean slices.