Quick single‑serve protein mug cake you can make in 2–3 minutes.
In a large microwave‑safe mug, whisk the egg, Greek yogurt, milk, sweetener, and vanilla (if using) until smooth.
Add protein powder, oat flour, cocoa (if using), baking powder, salt and mix well, scraping the sides so there are no dry pockets.
Microwave on high for 60–90 seconds until the top is just set and springs back lightly to the touch. Avoid overcooking so it stays moist.
Let it sit for 1 minute to finish setting. Top with extra yogurt, berries, or a drizzle of nut butter if you like, then enjoy.
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