Preheat the oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper and lightly grease it.
In a large bowl, whisk together the melted 1 cup unsalted butter, ½ cup peanut butter, 1 ½ cups brown sugar, and ½ cup granulated sugar until smooth. Add the 2 large eggs and 1 teaspoon vanilla extract, mixing until fully incorporated.
1 cup unsalted butter, ½ cup peanut butter, 1 ½ cups brown sugar, ½ cup granulated sugar, 2 large eggs, 1 teaspoon vanilla extract
In a separate bowl, whisk together the 2 cups all-purpose flour, ½ teaspoon baking powder, and 1 teaspoon salt.
2 cups all-purpose flour, ½ teaspoon baking powder, 1 teaspoon salt
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix.
Spread the batter evenly into the prepared baking pan. Press the 8 Nutter Butter cookiesinto the batter.
8 Nutter Butter cookies
Bake for 25-30 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out with a few moist crumbs.
Let the bars cool completely in the pan before slicing into squares. Enjoy as is, or drizzle with melted chocolate for extra indulgence!