This recipe combines fudge brownie and peanut butter cookie mixes into a festive Halloween bar. Layers of rich brownie and chewy peanut butter cookie are studded with Reese's candies, then baked and topped with candy eyeballs for a fun, easy-to-make dessert perfect for spooky celebrations.
When working with boxed mixes, be mindful not to overmix, as this can develop gluten and lead to a tougher texture; mix just until combined. For easy removal and clean cuts, always line your baking pan with parchment paper, leaving an overhang on the sides. Press the cookie dough layer evenly over the brownie base to ensure consistent baking and a balanced texture in every bite. Keep a close eye on baking time; brookie bars can quickly go from perfectly moist to dry. A slight jiggle in the center is acceptable, as they will set upon cooling. For a gourmet touch, a sprinkle of flaky sea salt before baking can beautifully contrast the sweetness of the peanut butter and chocolate. Ensure bars are completely cooled before slicing to achieve neat, defined pieces.