Preheat your oven to 350°F and grease a 9x5 inch loaf pan or similar size. While the oven heats, spread the chopped pecans on a small baking sheet and toast them for 5-7 minutes until fragrant and lightly golden, stirring halfway through. This brings out their natural oils and deepens their flavor. Set the toasted nuts aside to cool slightly.

In a large bowl, beat the softened butter with the brown sugar and sugar for about 2 minutes on medium speed until the mixture is light, fluffy, and pale—this incorporates air that helps the bread rise. Stop and scrape down the sides of the bowl as needed to ensure everything is well combined.

Add the room-temperature eggs one at a time to the creamed butter and sugar mixture, beating well after each addition. Pour in the vanilla and mix until combined. Stir in the mashed bananas until fully incorporated, then fold in the sour cream until the wet mixture is smooth and creamy. I find that using sour cream really makes the texture luxuriously moist and tender.

In a food processor or blender, pulse the oats for about 30 seconds until they resemble coarse flour—this helps distribute them evenly throughout the bread. In a separate bowl, whisk together the flour, oat powder, baking soda, baking powder, salt, cinnamon, nutmeg, and ground cloves. Make sure the leavening agents and spices are evenly distributed throughout the dry mixture.

Pour the dry ingredient mixture from Step 4 into the wet mixture from Step 3 and gently fold together with a spatula until just combined—don't overmix, as this can make the bread dense. Fold in the toasted pecans from Step 1 until evenly distributed. I always use King Arthur all-purpose flour because it gives me consistent results, but the quality of your ingredients really does matter here.

Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake at 350°F for 55-65 minutes, until a toothpick inserted into the center comes out with just a few moist crumbs (not wet batter, but a few crumbs indicate it's perfectly tender). The bread should be golden brown on top when done.

Remove the banana bread from the oven and let it cool in the pan for 20 minutes, which allows it to set slightly so it won't fall apart when you turn it out. Turn the bread out onto a wire rack to cool completely before slicing. This resting period ensures each slice stays moist and tender rather than crumbly.