Name: Best Cookie Butter Mug Cake - DIY Biscoff & High Protein
Prep time: 5 min
Cook time: 1 min
Total time: 6 min
Ingredients: ½ tsp Flaxseed Meal; 1½ Tbsp Water; 1 Tbsp Cookie Butter; 2 Tbsp Oat Flour (15g); 2 Tbsp Almond Flour (10g); 1½ Tbsp Vanilla Protein Powder (or sweetener); ¼ tsp Baking Powder; 2½ Tbsp Almond Milk (Unsweetened)

Soft, fluffy and the best Cookie Butter Mug Cake made with a healthy homemade lotus Biscoff spread and sweetened with protein powder. This Biscoff butter mug cake has no eggs and uses oat and almond flour – great gluten free and Vegan microwave mug cake recipe!

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I had so many plans for my homemade cookie butter, but this mug cake was so addictive I ended up finishing all my stock on this without even realizing it.

Extra bonus points here too because it’s sweetened with protein powder so there’s no sugar!

This was my evening snack for 3-4 days straight, and even 1.5x the recipe on some.

Major mug cake recipe lesson here: When you size up the quantities, use a bigger mug!

The first time I did bigger size of this cookie butter spread mug cake, I kept the same size mug and just increased the microwave time. The cake did cook, but the batter overflowed and just made a mess.

At least we know for next time!

Ingredients for Protein Cookie Butter Mug Cake

7 pantry staples is all you need for this homemade, biscoff or speculoos mug cake recipe!

Cookie Butter! I use my homemade low-fat cookie butter recipe here, but you can also use the regular Biscoff butter spread or Speculoos cookie butter too.
Vanilla Protein Powder to replace the sweetener and make a high protein biscoff mug cake. I use Quest vanilla protein powder for this recipe; It’s sweetened with stevia and makes these cookie butter protein balls sugar free too!

If you want to admit the protein powder. you can use any other sweetener. For a sugar free one-on-one sweetener I recommend Lakanto (code HAYLSKITCHEN gets you a discount).

Oat flour and Almond Flour; This make a soft gluten free mug cake!
Flaxseed Meal or ground flaxseeds to make that flax egg
Unsweetened Almond Milk – To keep it non-dairy and sugar free. Use a regular milk if you wish.
Baking Powder

How to make Biscoff Mug Cake with No Egg

This Biscoff cookie butter mug cake is super easy to make in the microwave and perfect for a quick dessert since all you need is 5 minutes!

Here’s how you make a tasty cookie butter mug cake:

Prepare the flax egg

To make this biscoff mug cake vegan, we use a flax egg – flaxseed meal combined with water and let to rest 2-3 minutes;

Can you melt cookie butter?

The next thing in this cookie butter spread mug cake is to melt the cookie butter to make it soft by microwaving it for about 5-7 seconds.

Melting the cookie butter before using it in the mug cake gives a much smoother batter.

Make the Biscoff Protein Powder Mug Cake batter

This part is really easy:

Add all the ingredients (oat flour, almond flour, vanilla protein power, almond milk, flax egg and baking power) to the melted Biscoff cookie butter and stir. You should have a smooth batter.

And now cook the Cookie Butter Mug Cake!

Grease a microwave safe mug or ramekin with coconut oil or cooking spray.

Pour the batter into the mug or ramekin

Microwave for 1 minute. The top of the cake should be just dry.
Microwave longer for 5 seconds at a time if needed.

Tips for the best Biscoff Butter Mug Cake

Melt the Biscoff cookie spread before combining with the rest of the ingredients so you get a smooth batter

Let the flaxseed meal-water mixture rest until it forms a slimy flax egg

Use room temperature milk

Grease the inside of the ramekin or mug so the cake comes off easily

How to serve Lotus Biscoff Mug Cake Recipe?

To really bring out the flavor in this recipe, serve the biscoff mug cake with biscuits and top it with some more biscoff butter!

Another really tasty combination is to top it with some vanilla ice cream!

More Biscoff Spread Snack Ideas

Make High Protein Cookie Butter Balls

Check out my homemade cookie butter recipe post for more things to do with biscoff butter!

Some more easy and healthy Microwave Mug Cake Recipes: