To prepare a vegan double chocolate peanut butter skillet cookie recipe, first you will need to prepare your ingredients. First, you'll need your flour, baking powder, sugar, salt, and cocoa powder. Then, add your wet ingredients to the dry ingredients and mix until everything is well combined. Next, pour your batter into the greased skillet and bake for 12-15 minutes, or until the edges are golden brown and the center is set.