In a microwave-safe bowl, whisk together the oat flour, protein powder, baking powder, and cinnamon until well combined.

Add the egg whites and almond milk to the dry mixture.

Stir vigorously until a smooth, thick batter forms with no lumps.

Microwave on high power for 90 to 120 seconds, or until the center is set and the edges pull away slightly from the bowl.

Let stand for 1 minute to finish setting before adding toppings.