Mix Dry Ingredients: In a microwave safe mug, add the flour, sugar, baking powder, salt, and cocoa powder. Stir well to combine, making sure to scrape along the sides and bottom.
Add Wet Ingredients: Pour in the melted coconut oil, dairy free milk, and vanilla extract. Stir until mostly smooth. A few small lumps are fine.
Add Chocolate Chips: Sprinkle the chocolate chips evenly over the top. Do not stir them in. More chips will create a gooier brownie, while fewer will result in a more cake like texture.
Cook: Microwave for 40 to 60 seconds until just set. Alternatively, bake in an oven safe mug on a baking sheet at 350°F for about 10 minutes.
Serve: Let cool briefly before enjoying.
Notes
Sweetness. Add up to 1 tablespoon extra sugar if you prefer a sweeter brownie.
Chocolate flavor. For deeper chocolate, add 1 teaspoon instant coffee. For a lighter taste, reduce cocoa powder by ½ tablespoon.
Liquid options. Swap dairy free milk with coffee creamer, cold coffee, or water if needed.
Doneness. The brownie is done when a toothpick comes out clean. A chewy or rubbery texture usually means it was overcooked due to microwave wattage.
Make ahead. Mix the dry ingredients in advance and store in a small container or bag for quick mug brownies later.