4 Ingredient Blueberry Banana Oatmeal Muffins: Step-by-Step Instructions

Yes, frozen blueberries work perfectly in these 4-ingredient blueberry banana oatmeal muffins! Just toss them in frozen—no need to thaw. This helps prevent them from bleeding too much into the batter. If you prefer fresh blueberries, those work great too. Either way, you’ll get juicy bursts of berry flavor in every bite.

The riper the bananas, the better! Look for ones with lots of brown spots—they’ll be sweeter and mash more easily. Overripe bananas add natural sweetness and moisture to these muffins. If your bananas aren’t quite ripe enough, you can bake them at 300°F for 15 minutes to soften them up. Just let them cool before mashing.

While almond flour will work, it’ll change the texture of your 4-ingredient blueberry banana oatmeal muffins. Oats give these muffins their signature hearty, wholesome texture. If you do use almond flour, you may need to adjust the liquid slightly. For a gluten-free option, stick with certified gluten-free oats—they’ll give you the best results while keeping the recipe simple.

These muffins can easily be both gluten-free and dairy-free! Just use certified gluten-free oats to avoid cross-contamination. The basic recipe contains no dairy ingredients. They’re naturally sweetened with bananas and get their moisture from the fruit too. It’s one of the things that makes these simple muffins so special—they accommodate many dietary needs without sacrificing flavor.

These 4-ingredient blueberry banana oatmeal muffins stay fresh for about 3 days at room temperature in an airtight container. You can extend their life to 5 days in the fridge, or freeze them for up to 3 months. They’re perfect for meal prep! If reheating, 15 seconds in the microwave brings back that just-baked warmth. The bananas help keep them moist even after a couple days.