Step 1

Combine 3 tablespoons of chocolate chips and coconut oil in a large microwave-safe mug; heat in the microwave for 20-second increments until melted; stir to combine.

Step 2

Add the protein powder, flour, water, and baking soda into the chocolate mixture. Stir until thoroughly combined.

Step 3

Add egg to the chocolate mixture; stir well.

Step 4

Heat in microwave until cake is cooked through, about 1 1/2 minutes. Sprinkle with remaining 2 teaspoons of chocolate chips.

Step 5

Cool cake for about 2 minutes before eating. Top with garnishes if desired.