Blueberry Crumble Muffin Mug Cake
Table of contents
You know that moment when you want a warm blueberry muffin but absolutely cannot be bothered to clean a muffin tin? This blueberry crumble muffin mug cake is the answer.
It is fluffy, fruity, and topped with a buttery crumble that makes it feel bakery-worthy. The center stays soft and gooey, almost like warm frosting, and the whole thing comes together in minutes using one mug and a spoon. No mixer, no trays, no commitment to a dozen muffins you did not plan on making.
This is perfect for a cozy breakfast, an afternoon snack, or a solo dessert moment when you want something warm and sweet that is just for you. Fair warning, once you make it once, you will want it again tomorrow.
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Why You’ll Love This Blueberry Crumble Mug Cake
• Ready in minutes
• Single serve and no leftovers
• Soft muffin texture with a gooey center
• Buttery crumble topping for bakery vibes
• High protein and surprisingly filling
• Microwave or oven-friendly
If you love blueberry muffins but want the easiest possible version, this mug cake checks every box.
What Makes This Taste Like a Bakery Muffin
There are two things doing the heavy lifting here.
First, the batter stays slightly underbaked in the center, which keeps it soft and rich instead of dry. Second, the crumble topping adds texture and that classic bakery muffin flavor that makes this feel extra special.
The molten center comes from a spoonful of Greek yogurt or almond butter layered into the middle, which melts into the cake as it cooks and keeps everything tender.
Key Tips for the Best Mug Cake
Do not skip the molten center.
That spoonful in the middle is what keeps the mug cake rich and bakery-like.
Start with less microwave time.
Begin at 60 seconds and add time in 5 to 10-second intervals. The top should look set while the center stays soft.
Frozen blueberries work great.
Use them straight from the freezer. They may add a little extra moisture, which actually works well here.
Use a stable mug or ramekin
A 6 to 8 ounce ramekin or sturdy mug works best and helps prevent tipping.
Let it cool briefly before eating.
One minute makes a difference. The center sets slightly, and you avoid burning your tongue.
Ingredient Swaps & Variations
No oat flour -> Almond flour or a gluten-free 1 to 1 blend
No protein powder -> Replace with 1 extra tablespoon of oat flour
Dairy-free -> Use almond milk and almond butter or dairy-free yogurt
Low on maple syrup -> Honey or agave works well
Extra gooey center -> Use Greek yogurt and slightly undercook
This recipe is forgiving and easy to customize based on what you have.
Storage & Reheating
This blueberry crumble muffin mug cake is best enjoyed fresh and warm. If needed, cover and refrigerate leftovers for up to 2 days. Reheat in the microwave for 15 to 20 seconds before serving.
Frequently Asked Questions
Yes. The microwave is the fastest method and works perfectly. Start with 60 seconds and adjust as needed.
Slightly undercook the mug cake and let it rest for one minute before eating.
Yes. Bake at 350°F for 18 to 22 minutes until just set and lightly golden.
Yes. Use them straight from the freezer without thawing.
A sturdy mug or a 6 to 8-ounce ramekin works best.
Yes. It is filling, lightly sweet, and works well as a cozy breakfast option.
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Blueberry Crumble Muffin Mug Cake
Ingredients
Muffin Base:
- 3 tbsp oat flour
- 1 tbsp protein powder vanilla or unflavored
- 1 tbsp maple syrup
- 1 egg
- 2 tbsp milk any kind
- 1/4 tsp vanilla extract
- 1/4 tsp baking powder
- Pinch of salt
- 2 tbsp fresh or frozen blueberries
- 1 tbsp Greek yogurt or almond butter for the molten center
Crumble Topping:
- 1 tbsp oat flour
- 1/2 tsp coconut oil or butter softened
- 1/2 tsp maple syrup
- Pinch of cinnamon
Instructions
Enable step-by-step mode- In a mug or small bowl, whisk together egg, milk, maple syrup, and vanilla.
- Stir in oat flour, protein powder, baking powder, and salt until just combined.
- Fold in blueberries, then pour half the batter into a greased mug or ramekin (6–8 oz).
- Add the Greek yogurt or almond butter in the center, then top with remaining batter.
- In a separate bowl, mix crumble topping ingredients until crumbly and sandy. Sprinkle on top.
To Microwave:
- Cook for 60–70 seconds, until the top is set but center is still soft. Let cool for 1 minute.
To Bake:
- Bake at 350°F for 18–22 minutes, until golden and just set. Cool for 5 minutes before eating.
