Anatomy of a Macaron
Macarons are meringue-based cookies, which entails whipping egg whites with powdered sugar and then folding the almond flour to incorporate it into the meringue.
As I mentioned before, a macaron contains two cookies, made up of egg whites sugar, and almond flour, with a buttercream/ganache/jam filling. You can add all kinds of food coloring (gel/powder) or flavors.