Place butter and sugar in a bowl, and combine till you have a thick batter.
Add flour, baking powder, cannabis, and cocoa powder, and combine with small amounts of water at a time until smooth. If adding any additional ingredients, add them now.
Using a tablespoon, dollop scoops of batter on the tray, ½ inch apart from each other and sides of the tray.
Place tray in preheated oven, and allow to bake for 10–20 minutes, until center is cooked. Pricking a toothpick in the center will let you know—if the batter sticks to the pick, it's not ready yet.