1
In a large microwave-safe mug, combine oat flour, protein powder, cocoa powder, baking powder, and sweetener.
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2
Pour in the milk and melted butter; stir until the mixture is smooth. If it seems too thick, add another splash of milk. If using, sprinkle chocolate chips on top.
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3
Microwave on high for 60 to 90 seconds. Start checking at 60 seconds and continue every 10 seconds until the cake is cooked through.
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