01 -
Preheat oven to 350°F. Butter a 9x9-inch baking pan and line with parchment paper, leaving an overhang on two sides. Butter the parchment paper.
02 -
In a large heatproof bowl over simmering water, melt 1/2 cup butter and semisweet chocolate chips, stirring until smooth. Remove from heat and whisk in granulated and brown sugars.
03 -
Whisk in eggs one at a time until fully combined. Add cocoa powder and salt, then fold in flour, chopped Reese’s, M&M's, and candy corn until evenly distributed.
04 -
Pour batter into prepared pan and bake 35 minutes or until a toothpick inserted in the center comes out with moist crumbs. Allow to cool completely.
05 -
Lift brownies from pan using parchment overhang and cut into 16 squares. Place squares on a parchment-lined rimmed baking sheet. Top each square with one marshmallow.
06 -
Microwave white chocolate chips with coconut oil in a medium heatproof bowl until melted, stirring until smooth.
07 -
Drizzle melted white chocolate over each marshmallow-topped brownie. Refrigerate until set, approximately 10 minutes. Use black decorating gel to create eyes and a mouth on each marshmallow.