Use either homemade or store-bought brownies and jazz them up to make a spooktacular decorated Halloween brownie with the Nightmare Before Christmas theme.
Cut 12 circles out of the brownie bar and place them onto a cookie sheet. Set aside.
Using a standing mixer, with paddles attached, beat the egg whites, powdered sugar, vanilla, and cream of tartar for 5-7 minutes until stiff peaks form. You may need to add ½ cup more confectioners sugar if the icing is too thick. Divide the icing into 4 bowls
Mix 1 color into each bowl until you get the desired colors you are looking for.
Using whichever color you like, pipe a triangle or some odd shape onto the top of the brownie and fill it in.
Repeat the same step with the remaining colors, making sure they touch
Using the black icing bag, pipe black lines over the parts where the colors meet to create Sallys “stitching”. Pipe small lines or x over the black lines to create the binding look of sally's dress
Allow the icing to harden. Squeeze the black frosting into the last piping bag.
Pipe a spider anywhere on the top of the brownies. Allow the frosting to harden for an hour before enjoying it.
Allow the frosting to harden for an hour before enjoying it.
Notes
Note 1: Do not use boxed egg whites, they will not work for this frosting.