Preheat oven to 350°F and line a baking sheet with a perforated baking mat.
Cream butter and sugar until smooth, about 2 minutes. (No need to excessively cream as it can lead to cookie spread.)
Beat in red velvet flavouring and egg.
In a separate bowl, combine baking powder, cocoa powder, salt, and flour. Add to wet ingredient mixing bowl a little at a time.
Mix until thoroughly blended and the dough begins to come off the edges of the bowl.
Take a third of the dough out at a time and roll out to 1/4" thick on a floured surface..
Dip the stamp in loose flour and tap off the excess. Re-flour the stamp after every 2-3 cookies.
Gently press down into the dough to create the design and if needed use a round cookie cutter to cut out the shape.
Place on the prepared baking sheet.
Bake for 7-8 minutes (approximately 9 in my oven).
Cool cookies on cookie sheet for 10 minutes then transfer to cooling rack.
Coat bottoms in chocolate and brush the tops with edible glitter, if desired.