3very ripe bananas,mashed or pureed (thawed frozen bananas are fine)
1/2cuplightly packed brown sugar
2largeeggs
1teaspoonvanilla extract
1/4cupbuttermilkor plain yogurt
1/2cupwalnuts or pecans,toasted and coarsely chopped (or chocolate chips - optional)
Instructions
Melt butter in a small skillet over medium heat. Continue cooking butter until it turns golden brown and becomes fragrant, about 5 minutes. Pour into a medium heatproof bowl to cool.
Move oven rack to middle position and heat oven to 350°F. Lightly grease an 8x5" loaf pan and set aside.
In a large bowl, whisk together the all purpose flour, whole wheat flour, baking soda and salt.
Add the bananas, brown sugar, eggs, vanilla and buttermilk to the bowl with the browned butter, and stir. Gently fold the banana mixture into the flour mixture and stir until just barely mixed (you may still see little bits of dry flour). Fold in the walnuts (if using) and mix until just incorporated. Don't overmix.
Pour batter into the prepared loaf pan and spread with a spatula. Bake until a toothpick inserted in the center comes out clean, 45-55 minutes. Cool in pan for 10 minutes, then remove from pan and continue cooling on a wire rack. Cut and serve. Store leftovers in an airtight container at room temperature for up to 2 days, or freeze.