Step 1

Stir together the dry ingredients in a bowl - almond flour, coconut flour, baking powder, sweetener. Take care to break up any lumps.

Step 2

In a second bowl, whisk the egg using a fork. Then add the melted and cooled butter plus the vanilla extract and whisk until combined.

Step 3

Add the dry ingredients to the wet and stir until a smooth batter forms.

Step 4

Grease a mug or ramekin with butter and fill in the batter. Microwave for 80 seconds @ 900W. (Baking times for different power levels are included in the notes below).

Step 5

Enjoy straight from the mug or invert onto a plate.