The vanilla protein powder is optional, but it is what pushes the protein up and gives the cake that cake-batter flavor. Without it the cake still works, just lighter on protein. Do not overcook it. Mug cakes go from soft to rubbery fast, so pull it the second the top is set, starting at 45 seconds. No oat flour on hand? Blend rolled oats into a fine flour and measure after blending. Nutrition is an estimate calculated from standard ingredients and will shift with the protein powder and sprinkles you use, so run it through a macro calculator with your exact products before putting a number on screen.
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