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Export 4 ingredients for grocery delivery
Step 1
Place butter in a microwave-safe mug. Microwave until melted, about 15 seconds. Swirl mug until fully coated.
Step 2
Combine almond flour, egg, baking powder, and salt in the mug; whisk until smooth.
Step 3
Microwave at maximum power until set, about 90 seconds. Let cool for 2 minutes before slicing.