Last updated on November 24th, 2025 at 06:30 pm
Craving that cozy coffee cake flavor but short on time? This Coffee Cake Protein Mug Cake gives all the warm, cinnamon-swirled vibes in under a minute with added protein and minimal cleanup. It’s perfect for busy mornings, a quick post-workout treat, or a healthier dessert that still tastes delicious. You’ll have this healthy single-serve dessert ready fast, so you can stay on track without sacrificing comfort.
Jump to Recipe
Ingredients for Coffee Cake Protein Mug Cake
- 3 tbsp vanilla protein powder
- 1 tbsp oat flour (or all-purpose flour)
- 1 tbsp brown sugar
- 1/4 tsp baking powder**
- Pinch of salt
- 3 tbsp milk
- 1 tbsp melted butter or coconut oil
- 1/2 tsp vanilla extract
- 1/2 tsp cinnamon
**Note about baking powder: If your mug cake rises too much or overflows, try omitting the baking powder next time. Some protein powders don’t need it for lift. I used Optimum Nutrition whey protein, and it baked perfectly without any baking powder.
Streusel:
- 1 tsp butter
- 1 tbsp oat flour
- 1 tsp brown sugar
- Pinch of cinnamon (optional)
How to Make Coffee Cake Protein Mug Cake
1. In a microwave-safe mug, combine the protein powder, oat flour, brown sugar, baking powder, salt, and cinnamon. Stir until dry ingredients are evenly mixed.
2. Add the milk, melted butter or coconut oil, and vanilla extract. Stir until the batter is smooth and lump free, scraping the sides of the mug.
3. Make the streusel by mixing the butter, oat flour, brown sugar, and cinnamon in a small bowl until crumbly. You can use a small fork or your fingers for best results.
4. Microwave your mug cake about halfway (25-30 seconds)
5. Sprinkle the streusel evenly over the top of the batter in the mug.
6. Microwave until done, which should be another 25-30 seconds. Stop at 25 seconds and start checking. I usually add 10 seconds at a time after that until it’s done, but if your microwave is particularly strong, I would recommend an extra 5 seconds at a time.
7. Let the mug cake cool for 1 to 2 minutes to cool and enjoy fresh of out the mug.
Pro Tips
- If your mug cake rises a little too much or looks like it’s about to overflow, your protein powder might not need baking powder at all! Different brands react differently, so if that happens, just skip the baking powder next time. You’ll still get a delicious, fluffy cake without the drama.
- Microwaves vary a lot. If the center is still wet after 60 seconds, use 10-second bursts to avoid overcooking and a rubbery texture.
- Want that tall, bakery-style mug cake look like in my photos? Just double the recipe! It’ll fill the mug beautifully and give you a picture-perfect cake with the same soft texture and flavor.
- If you don’t have oat flour, but you do have oats and a bullet blender, you can just grind up some old fashioned oats in the blender for a few seconds and that’s it! You’ll have nice, fluffy oat flour.
FAQs
Q: How many servings does this make?
A: This is a single-serve mug cake perfect for one quick breakfast, snack, or post-workout treat.
Q: What brand of protein powder should I use?
A: That is a question that depends on so many factors, I could write pages just on that! I guess the simple answer (that I know isn’t at all helpful!) is, whichever one you like or have on hand. The beauty of mug cakes is, they’re single-serve and very flexible, so if you find your protein powder is kind of bitter, you might add more sugar next time, or if your protein powder gives it a chalky taste, you could add a bit more milk and/or yogurt. If it helps you at all, I used Optimum Nutrition Gold Standard protein powder in the vanilla ice cream flavor, and I found that it did not need baking powder with that one.
Q: What can I do if my mug cake turns rubbery?
A: That usually means it was overcooked. Reduce the cook time by 10 to 15 seconds next time and try a larger mug so the cake can expand without overcooking.
This Coffee Cake Protein Mug Cake is an easy way to satisfy a craving without derailing your day. It’s quick, comforting, and customizable so you can tweak sweetness, dairy, or gluten to match your goals. Try it for breakfast, a quick dessert, or a post-workout snack.
Coffee Cake Protein Mug Cake
Ingredients
Coffee Cake Mug Cake
- 3 Tbsp vanilla protein powder
- 1 Tbsp oat flour or all purpose flour
- 1 Tbsp brown sugar
- 1/4 tsp baking powder **see note
- pinch salt
- 3 Tbsp milk
- 1 Tbsp melted butter
- 1/2 tsp vanilla
- 1/2 tsp cinnamon
Streusel
- 1 tsp butter
- 1 Tbsp oat flour
- 1 tsp brown sugar
- pinch cinnamon optional
Instructions
- In a microwave-safe mug, combine the protein powder, oat flour, brown sugar, baking powder, salt, and cinnamon. Stir until dry ingredients are evenly mixed.
- Melt just one tablespoon of butter, but keep 1 teaspoon solid butter for the streusel
- Add the milk, melted butter or coconut oil, and vanilla extract. Stir until the batter is smooth and lump free, scraping the sides of the mug.
- Make the streusel by mixing a teaspoon of butter, oat flour, brown sugar, and cinnamon in a small bowl until crumbly. You can use a small fork or your fingers for best results.
- Microwave your mug cake about halfway (25-30 seconds)
- Sprinkle the streusel evenly over the top of the batter in the mug.
- Microwave until done, which should be another 25-30 seconds. Stop at 25 seconds and start checking. I usually add 10 seconds at a time after that until it’s done, but if your microwave is particularly strong, I would recommend an extra 5 seconds at a time.
- Let the mug cake cool for 1 to 2 minutes to cool and enjoy fresh of out the mug.
