Add the oat flour, cocoa powder, baking powder, salt, cinnamon, and cayenne pepper to the food processor and grind the oats into flour. Add the beans, flax eggs, maple syrup, vanilla, and water and process until the batter is smooth and creamy. If it’s too thick add 1 teaspoon of water at a time until it’s spreadable, but not watery. It should be thicker than cake batter, but not as thick as cookie dough.