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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.
Add the protein powder, flour, water, and baking soda into the chocolate mixture. Stir until thoroughly combined.
Add egg to the chocolate mixture; stir well.
Heat in microwave until cake is cooked through, about 1 1/2 minutes. Sprinkle with remaining 2 teaspoons of chocolate chips.
Cool cake for about 2 minutes before eating. Top with garnishes if desired.