Top chocolate brownies with cookie "mummies" for a two-for-one Halloween dessert.
Preheat oven to 350°F. Line a 13x9x2-inch baking pan with parchment paper, leaving 1-inch on either side. Coat parchment with cooking spray; set aside. In a large saucepan, combine chocolate, butter, and the water; cook and stir over low heat until chocolate is melted. Transfer to a very large bowl.
Add granulated sugar and brown sugar to chocolate mixture; beat with an electric mixer on low to medium speed until combined. Add eggs and vanilla; beat on medium speed for 2 minutes. Add flour, salt, and cinnamon. Beat on low speed until combined. Spread batter in prepared pan.
Bake for 30 minutes or until a toothpick inserted near center comes out clean.
Meanwhile, line a baking sheet with waxed paper, set aside. Dip cookies in candy coating and transfer to prepared baking sheet to set. Transfer remaining candy coating to a resealable plastic bag. Drizzle remaining candy coating over cookies. Place candies on top as eyes. Let stand until set.
While brownies are hot, place cookies on top, about 1-inch apart, pressing lightly. Let brownies cool completely in pan on wire rack. Use foil to lift uncut brownies from pan. Remove foil and cut into bars.