Warm butter in a microwave-safe mug or ramekin until melted.
Then, add the cake flour, Biscoff cookie, sugar, baking powder, egg, milk, and olive oil. Whisk to combine.
Wipe down the sides of the mug and microwave for 1 minute. Continue cooking for 30 seconds at a time (depending on the strength of your microwaves). Check the cake with a toothpick; it should come out dry when it's finished cooking.
Melt the Biscoff Cookie Butter in the microwave for 20 seconds using the melt function. Stir and drizzle it on top, followed by the crumbled Biscoff Cookies.
Notes
Expert Tips:
Select the right size mug. Using one that is too small will cause the cake to overflow, while a large one will prevent the cake from reaching the top.
Use room temperature ingredients to ensure they incorporate and cook perfectly- especially the butter.
Gently stir the batter until the ingredients are combined; over-mixing produces a dense and tough final cake.
Wipe down the sides of the mug before cooking to ensure the cake properly rises.
If you prepare more than one cake at a time, increase the cooking time.
Slide a butter knife around the edge to loosen up the cake and place it on a plate before decorating it if you want a fancier-looking cake.
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.