Preheat the oven to 350°F (180°C) and prepare a 12-cup muffin pan.Tip: These oil-free muffins are naturally a bit sticky, so lightly oil the paper liners, or skip the liners and oil a non-stick muffin pan well to help the muffins release easily after baking.
In a large bowl, mash 3 large ripe bananas until mostly smooth. Add 1 large egg, ½ cup Greek yogurt, ¼ cup honey, and 2 teaspoons vanilla extract. Mix well.
Add 1½ cups all-purpose flour, 1 cup rolled oats, 2 teaspoons baking powder, ½ teaspoon baking soda, ½ teaspoon cinnamon, and 1 pinch salt. Stir gently until just combined. Do not overmix.
Gently fold in 1½ cups blueberries so they don’t break.
Spoon the batter into the liners, filling them all the way to the top.
Bake at 350°F (180°C) for 22 minutes, until a toothpick inserted in the center comes out mostly clean.Let the muffins cool in the pan for 5 minutes, then move them to a rack. Let cool completely before removing the liners.
Substitutions
Blueberries –> Raspberries, chopped strawberries, blackberries, or frozen mixed berries
Bananas –> Unsweetened applesauce, mashed pear, or pumpkin purée
Egg –> Swap with 3 tablespoons chia seeds mixed with 4 tablespoons water if needed.
Greek yogurt –> Low-fat Greek yogurt, Skyr for extra protein, plain yogurt, or dairy-free yogurt
Honey –> Maple syrup, brown sugar, or white sugar
Rolled oats –> Quick oats or spelt flakes
All-purpose flour –> Whole wheat flour or a 1:1 gluten-free baking blend
Cinnamon –> Nutmeg, cardamom, or pumpkin spice
Vanilla extract –> Almond extract (use less) or omit if needed
Tips
Oil well: These muffins are sticky. Oil liners or the pan so they release easily.
Use ripe bananas: Spotty bananas add sweetness and moisture.
Mix gently: Stir just until combined to keep muffins soft.
Fill to the top: This helps the muffins bake tall and full.
Cool first: Let muffins cool completely before peeling the liners.
Frozen stays frozen: Add frozen blueberries straight from the freezer.
Press to test: The top should spring back when done.
Store cooled: Once completely cool, store them in a plastic bag or airtight container at room temperature for up to 2 days, or in the fridge for up to 5 days.