1. Gather Your Ingredients and Mug: Start by getting all your ingredients ready and selecting a microwave-safe mug that holds at least 12 ounces. A wider mug often helps the cake cook more evenly.

2. Combine Dry Ingredients: In your chosen mug, add the chocolate protein powder, unsweetened cocoa powder, all-purpose flour (or oat flour), baking powder, and a pinch of salt. Use a small whisk or a fork to thoroughly mix these dry ingredients together. This step is important to prevent lumps and ensure the baking powder is evenly distributed.

3. Add Wet Ingredients: Pour in the milk, maple syrup (or honey), unsweetened applesauce (or mashed banana/oil), and vanilla extract.

4. Mix Until Just Combined: Stir all the ingredients together with your fork or whisk until a smooth batter forms. Be careful not to overmix; just combine until there are no dry streaks of flour or protein powder. The batter should be thick but pourable.

5. Stir in Chocolate Chips (Optional): If you’re using chocolate chips, fold them into the batter now. This adds an extra layer of chocolatey goodness.

6. Microwave the Mug Cake: Place the mug in the microwave and cook on high for 60-90 seconds. Cooking time can vary significantly based on your microwave’s wattage. Start with 60 seconds, then check for doneness. The cake should look set around the edges and slightly moist in the center. It will continue to cook slightly as it cools.

7. Rest and Serve: Carefully remove the hot mug from the microwave. Let the mug cake rest for about 1-2 minutes before digging in. This allows it to firm up a bit and cool down to an enjoyable temperature. Serve directly from the mug, or carefully invert it onto a plate if you prefer.