Best Blueberry Banana Muffins

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These Blueberry Banana Muffins are a two-in-one breakfast treat - a combination of banana bread and blueberry muffins! The moist banana bread muffin batter is made with sour cream and filled with lots of fresh blueberries. Make these muffins in less than an hour the night before and then enjoy their delicious flavors for breakfast!

Blueberry banana muffins in a basket with a towel.

I remember the first time I ever tried a blueberry banana smoothie in college. I completely fell in love with the combination of fruits! The subtle tartness in the blueberries compliments the sweet bananas so well! Plus, with 2 cups of fruit in the batter, they're basically healthy, right?

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Why You'll Love This Recipe
Ingredients
Substitutions & Variations
How to Make Blueberry Banana Muffins
Expert Baking Tips
Recipe FAQs
Storage
More Recipes You'll Love
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Why You'll Love This Recipe

These banana muffins with blueberries are even better the next day, after the flavors have had time to develop.
It uses staple baking ingredients that you likely already have in your pantry and refrigerator.
They're super simple to make in just a few steps, without the need of an electric mixer.
It's an extra fruity version of my Chocolate Chip Banana Bundt Cake recipe!

Ingredients

Mashed bananas get mixed into the muffin batter. You'll want about 2-3 medium bananas on hand. Make sure they are overripe so they are easy to mash. Ideally they'll be much more brown than shown above, but sometimes you have to work with what ya got!
Fresh blueberries add sweet, tart pops of flavor throughout these banana berry muffins. You can use frozen blueberries (do not thaw) if fresh aren't in season.
Sour cream and vegetable oil make the muffins really rich and moist.
Baking powder and baking soda give these muffins the perfect bakery rise.

See recipe card below for a full list of ingredients and measurements.

Substitutions & Variations

Mix in cinnamon, chopped toasted nuts, and/or chocolate chips for a loaded version of these banana and blueberry muffins.
Top the filled muffin cups with chocolate chips or cinnamon sugar before baking.
Drizzle a glaze on top of the baked muffins once they are cooled for a sweeter version.
Try baking them in a jumbo muffin pan or a mini muffin pan for various sizes! See the recipe card notes below for more instructions.

This recipe has not been tested with other substitutions or variations. If you replace or add any ingredients, please let us know how it turned out in the comments below!

How to Make Blueberry Banana Muffins

Blueberries tossed in a mixture of flour, baking powder, baking soda, and salt.

Step 1: In a medium bowl, whisk the all purpose flour, baking soda, baking powder, and salt to combine. Gently toss in the blueberries to coat them in the flour mixture.

Whisking vegetable oil, sugar, egg, vanilla extract, sour cream, and mashed bananas in a bowl.

Step 2: In a large bowl, whisk the vegetable oil and granulated sugar well. Mix in the egg, vanilla extract, and sour cream. Then add the mashed bananas and thoroughly mix.

Blueberry and banana muffin batter in a bowl.

Step 3: Gently fold the dry ingredients into the wet mixture.

A muffin pan filled with banana blueberry batter.

Step 4: Fill 12 cupcake liners with muffin batter. Bake at 400°F for 5 minutes, then reduce the temperature to 350°F and continue baking until a toothpick comes out clean.

Expert Baking Tips

If you are using frozen blueberries, use them straight from the freezer, and don't thaw them. This helps prevent too much bleeding from the juice.
Carefully fold the dry ingredients into the wet ingredients so the blueberries don't pop and bleed and the batter doesn't get overmixed.
I highly recommend using a scale to weigh the flour in grams. Weighing the flour is a much more accurate way to measure it and will ensure your muffins turn out just like the recipe intended.

Recipe FAQs

How do I now if my bananas are overripe?

Overripe bananas are mostly brown with a little yellow left, and you will be able to smell them as soon as you walk into the kitchen. The browner the bananas get, the sweeter they will taste!

What's the best way to mash bananas?

The fastest way is to place the overripe bananas in a bowl and use a hand mixer to mash them. You can also mash them with a fork on top of a plate or in a bowl.

How do you prevent the blueberries from sinking to the bottom of the muffins?

Coating the blueberries in flour before folding them into the muffin batter helps keep them from sinking as the muffins bake.

Why do I need to bake these at two different temperatures?

The initial 5 minutes at 400°F is to give the muffins a quick rise from the start! However, keeping them at this temperature will make them bake too quickly and potentially dry out. So, we lower the temperature to 350°F (without opening the oven door) for the rest of the time.

Why are there green spots in my muffins?

This could be from using your leavening agent reacting with the blueberries. It's totally safe and still delicious! You should be able to prevent this by using baking powder and soda without aluminum. Or, toss the blueberries in a little bit of flour only before folding them into the batter.

A banana blueberry muffin cut in half on a plate.

Storage

Room Temperature

When the blueberry banana muffins have cooled, store them in an airtight container right away so that they don't dry out! As with banana bread, these muffins are even more moist and flavorful the next day or two, so this is the best time to enjoy them! However, they should last for up to 5 days.

Freezing Instructions

Let the muffins cool completely, and then store them overnight in an airtight container at room temperature so that the flavor and texture can fully develop. The next day, transfer them to a freezer-safe container and store for up to 1 month.