Instructions

• Preheat the oven to 350°F (175°C). Line a 9×13-inch baking dish with parchment paper, leaving an overhang for easy removal, and set aside.
• In a large mixing bowl, cream together the 12 tablespoons unsalted butter and 2 cups light brown sugar until light and fluffy, about 2–3 minutes.
• Add the ½ cup creamy peanut butter and mix until fully incorporated.
• Add the 2 large eggs one at a time, beating well after each addition. Stir in 1 tablespoon vanilla extract.
• In a separate bowl, whisk together 2 cups all-purpose flour, 1 cup old-fashioned oats, 2½ teaspoons baking powder, and ¼ teaspoon salt.
• Add the dry mixture to the wet mixture and stir just until combined; do not overmix.
• Stir in 1 cup semi-sweet chocolate chips until evenly distributed.
• Spread about two-thirds of the dough evenly across the bottom of the prepared pan (use a spatula or lightly greased hands to press it down).
• Arrange the 12 fun-size Snickers bars, halved, in a single layer over the dough.
• Drop the remaining dough over the Snickers by teaspoonfuls (it does not need to cover all the Snickers).
• Bake for 27–29 minutes, until the edges are golden and the center is set.
• Cool completely in the pan on a wire rack. Use the parchment overhang to lift the bars from the pan, then cut into bars.