Add 1⅓ cups oat flour, 1 cup almond flour, ¼ cup black cocoa powder, ½ cup maple syrup, 3 tablespoons coconut oil, and ½ teaspoon salt to a food processor or mixing bowl. Blend until a ball of dough forms. If it's too crumbly, add a bit more coconut oil; if too wet, add a touch more oat flour.