Halloween Monster Cookies - The BakerMama

Ingredients

• 1/2 cup (1 stick) unsalted butter, room temperature
• 1/2 cup granulated sugar
• 1/4 cup brown sugar
• 1 large egg
• 1/2 teaspoon vanilla
• 1 cup all-purpose flour
• 1/4 cup dark cocoa powder
• 1/2 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon kosher salt
• 1 (12 ounce) bag mini multi-colored chocolate covered candies
• 30 bite-sized vanilla cream-filled cookie sandwiches
• 1 pouch white decorator’s cookie icing