Use a microwave-safe mug. Add 1/4 cup gluten-free all-purpose flour, 1/4 cup coconut sugar, 3 Tbsp cocoa powder, 1 pinch sea salt, and 1/4 tsp ground cinnamon to the mug. Stir well to combine the dry ingredients.
Add 3 Tbsp avocado oil (or melted coconut oil), 3 Tbsp water, and 1/8 tsp pure vanilla extract to the mug. Stir until the batter is smooth and there are no visible dry streaks of flour.
Stir 1 Tbsp chocolate chips into the batter until evenly distributed.
Wipe any batter from the rim of the mug and smooth the top with the back of the spoon.
Microwave on high for 40–50 seconds, until the center is just set but still appears slightly moist (microwave times may vary).
Let the mug brownie cool for about 30–60 seconds, then enjoy carefully—the mug and brownie will be hot.
Notes
Microwave times vary by appliance; adjust time as needed to avoid overcooking.
Serves 1.