1/4cup unsalted butter (melted and cooled) or vegetable oil
1 lemon (zest + 1/4 cup juice)
1 egg
2/3cup blanched almond flour
2 tablespoons oat flour
1 teaspoon baking powder
1/4 teaspoon salt
sprinkle of powdered sugar
Instructions
Whisk the wet ingredients: In a medium bowl, whisk together the butter or oil, egg, coconut sugar, lemon zest, and lemon juice. Make sure the ingredients are well combined.
Add the dry ingredients: Add the almond flour, oat flour, baking powder, and salt to the bowl with the wet ingredients. Whisk again until everything is well combined and there are no lumps.
Divide the batter: Pour the batter evenly into two shallow mugs or ramekins. You want each mug to be about half to 3/4 full, to allow room for the cake to rise as it cooks. You can use a taller mug for one big serving, just make sure to cook it for longer (see below).
Microwave the cake: Place one mug at a time in the microwave and cook for 1 – 2 minutes on high power. Keep a close eye on the cake as it cooks, as microwave times can vary depending on your mug. If you’re using a shallow mug or ramekin, cook time will be closer to 1 minute. If you’re using a taller mug with all of the batter, cook time will be closer to 2 minutes. The cake should rise up and the center should be set, but still slightly moist.
Sprinkle and enjoy: Once the cake has cooled a bit, you can add a glaze or frosting if you like. I sprinkled mine with some powdered sugar and a fresh lemon wedge for garnish.