Banana Oat Walnut Muffins

These small oat muffins combine mashed banana, chopped dried banana, and toasted walnuts for three distinct textures. Blending the oats into flour gives the batter more structure than leaving them whole, while eggs keep the crumb tender. A little cinnamon complements the fruit without hiding its flavor.

Recipe details

Yield: 6 standard muffins
Prep: 15 minutes
Bake: 16–20 minutes
Equipment: six-cup muffin pan or six silicone cups, blender or food processor, mixing bowl, whisk, spatula, wire rack, instant-read thermometer

Ingredients

40 grams old-fashioned rolled oats
1 teaspoon baking powder
1/2 teaspoon ground cinnamon
1/8 teaspoon fine salt
1 medium very ripe banana, peeled and mashed (about 115 grams)
3 large eggs
2 tablespoons banana-flavored sugar-free syrup or maple syrup
1/2 teaspoon vanilla extract
10 grams dried banana, finely chopped
15 grams walnut halves, toasted and finely chopped
Nonstick cooking spray

Method

Heat the oven to 375°F (190°C), or 350°F (175°C) for a fan oven. Coat six muffin cups lightly with spray or arrange silicone cups on a sturdy tray.
Process the oats until they resemble a fine, slightly sandy flour. Whisk them with the baking powder, cinnamon, and salt.
In a separate bowl, whisk the mashed banana, eggs, syrup, and vanilla until the egg whites are fully broken up. Stir in the oat mixture. Fold in the dried banana and all but 1 teaspoon of the walnuts. Rest the batter for 5 minutes so the oats can hydrate.
Divide evenly among the six cups, filling each about three-quarters full. Sprinkle with the reserved walnuts. Bake 16–20 minutes, rotating the pan once, until the tops are golden and spring back when pressed. A tester should show moist crumbs but no liquid egg; the centers should reach at least 160°F (71°C).
Cool in the pan for 5 minutes, then transfer the muffins to a rack. Their centers continue to set as they cool, so wait at least 15 minutes before serving.

Texture cues and troubleshooting

Because this batter contains only a small amount of oat flour, the muffins are moist and custardy rather than bread-like. Grinding the oats finely and allowing the short rest prevents a coarse texture. Exact banana weight matters: an oversized banana can leave the centers wet even when the tops look done.

If the muffins rise and then collapse sharply, they were underbaked or the batter was overfilled. Use six cups and check the center temperature. Finely chopped additions distribute evenly; large walnut pieces can sink. Toast walnuts for 4–6 minutes in the heating oven and cool them before mixing.

Substitutions and storage

Pecans may replace walnuts by weight. If using maple syrup instead of sugar-free syrup, the muffins will be slightly sweeter and browner. Do not substitute coconut flour for the ground oats. Refrigerate cooled muffins in an airtight container for up to 4 days because of the egg-rich crumb. Freeze for up to 2 months, then thaw in the refrigerator and warm briefly before serving.

Banana Oat Walnut Muffins