These easy, one-bowl Oatmeal Banana Chocolate Chip Muffins are the perfect way to use up overripe bananas! With hearty oats, sweet banana, and just the right amount of chocolate, they’re a wholesome, satisfying treat for breakfast or snack time.

Oatmeal Banana Muffins, But Better

We’re finishing my year-long series on muffins with what is probably the most made muffin recipe in my house. We always have some in the freezer for quick school breakfasts, and I make them every time a friend has a new baby (easy one-handed breakfast? Yes, please!).

Whenever I find myself with a few sad, spotty bananas hanging out on the counter (or buried in the freezer), I go straight to these banana oatmeal muffins. Soft and fluffy? Yes. Just the right amount of sweetness? Absolutely. A little texture from oats and some melty chocolate chips for balance? 100%.

One of the best parts? It’s a simple, mix-by-hand recipe that doesn’t require fancy equipment or hard-to-find ingredients. And if you’re like me and have a freezer stash of ripe bananas on hand, you’re already halfway there.

That said, one small change makes a huge difference in texture: if you’re using frozen bananas, be sure to thaw and drain them. I’ve tested both ways, and the difference is clear. Muffins made with drained bananas bake up tall and domed, with a fluffy, tender crumb. Muffins made with the thawed liquid? Flat, gummy, and dense. You’ll see the photo comparison in the post, but trust me, the strainer is worth it.

And because I love a muffin that plays well with others, these are endlessly adaptable. Swap the chocolate chips for berries, add chopped nuts, or bake a double batch and freeze half for later. Let’s get into it!

Ingredients and Substitutions

Here’s what you’ll need to make these oatmeal banana muffins, along with some key recipe notes and substitutions listed below.

• All-Purpose Flour: You can substitute up to half of the flour with whole wheat flour if desired. For gluten-free muffins, use a 1:1 gluten-free all-purpose flour blend.
• Old-Fashioned Rolled Oats: Quick oats can be used in a pinch, but avoid steel-cut oats.
• Brown Sugar: Coconut sugar works as a 1:1 substitute.
• Egg: For egg-free, use a flax egg (1 tbsp ground flax + 3 tbsp water).
• Milk: Use dairy or any unsweetened non-dairy milk (almond, oat, soy, etc.).
• Vegetable Oil: Melted butter, coconut oil, or even avocado oil are good alternatives.
• Mashed Bananas: Use ripe to very ripe bananas for the best flavor. If frozen, thaw and drain.
• Chopped Nuts (Optional): Walnuts or pecans add crunch. Leave them out for nut-free.

How to Make Oatmeal Banana Chocolate Chip Muffins

1. Mix the Wet Ingredients: Whisk together egg, milk, oil, and vanilla. Stir in mashed banana until smooth.

2. Add the Dry Ingredients: Add flour, oats, sugar, leavening agents, spices, and salt. Stir until just combined.

3. Fold in Mix-Ins: Gently stir in chocolate chips or other desired mix-ins (nuts, dried fruit, etc).

4. Rest the Batter: Let the batter sit for 30 minutes (or up to 2 hours) to hydrate the oats and develop structure.
5. Bake: Divide the batter evenly into 12 parchment-lined muffin cups and bake at 400°F until the tops spring back when gently pressed. Let muffins rest in the tin for 5 minutes, then transfer to a wire rack.

Drain Frozen Bananas for the Best Texture

Frozen bananas are a great way to preserve overripe fruit, but they introduce one key variable: excess water. When bananas thaw, their cell walls break down, releasing a lot of liquid. If you use that liquid in your batter, you’re changing the hydration ratio of the recipe.

Kitchen Chemistry

Frozen bananas release excess liquid as the cell walls break down while they thaw, which can weigh down baked goods and lead to underbaked centers. Draining thawed bananas reduces excess moisture, resulting in taller, fluffier muffins with a better crumb texture.

When frozen bananas are drained (I recommend thawing them right in a mesh strainer set over a bowl), we get the banana flavor and natural sugars without the added water. This helps the muffins bake up taller with a more open, fluffy crumb.

It’s a simple step that yields noticeably better muffins, especially when banana is the main ingredient!

For this recipe, I made two batches: one with drained bananas and one with all the thawed liquid. The difference in appearance and texture is striking (photo below; undrained on the left, drained on the right), and it all comes down to water content. The drained version has a domed top and a soft, tender interior, while the undrained version is flatter and more compact.

Tips and Tricks for the Perfect Banana Oatmeal Muffins

1. Use Ripe Bananas: Not overripe, mushy bananas, but bananas that have brown speckled skins will result in stronger banana flavor and natural sweetness.
2. Thaw Frozen Bannas: Strain any excess liquid from frozen bananas prior to using.
3. Rest the Batter: This gives the flour and oats time to hydrate and absorb liquid for a better texture.
4. Check for Doneness: The muffin tops should psring back when lightly pressed.
5. Cool on a Rack: Move the muffins to a cooling rack, which will prevent soggy bottoms.
6. Customize Mix-Ins: Try swapping chocolate for berries, nuts, dried fruit, or shredded coconut for endless varieties.
7. Storage: These muffins can be stored in an airtight container at room temperature for 3 days, in the refrigerator for 5 days, or frozen for up to 3 months.
8. Recommended Tools: Mixing Bowl | Mesh Strainer | Muffin Liners | Muffin Tins | Cooling Rack

More Banana Recipes

• Banana Split Bundt Cake
• Nutella Banana Bread
• Banana Bread Muffins
• Fudgy Banana Brownies
• Peanut Butter Chocolate Chip Banana Bars