Fluffy Bakery Style Banana Muffins are jumbo, soft muffins with a crunchy nut topping. These easy-to-make muffins are extra moist thanks to oil and sour cream or yogurt, and the crunchy, sugary tops get an extra bite from chopped walnuts.
In a separate large bowl, whisk together the sugars, butter, vegetable oil, vanilla, egg, and sour cream until combined. Gently fold in the bananas with a rubber spatula.
½ cup granulated sugar, ¼ cup brown sugar, 6 tablespoons unsalted butter, ¼ cup vegetable oil, 1 teaspoon vanilla paste or extract, 1 large egg, ¼ cup sour cream
Add in the dry ingredients and walnuts and gently fold it into the wet ingredients with a rubber spatula until it is just combined.
½ cup chopped walnuts
Distribute the batter evenly between the liners, filling the whole way to the top, then sprinkle chopped walnuts and the turbinado sugar to cover the tops.
demerara or turbinado sugar for muffin tops
Bake at 425℉ for 5 minutes, then reduce the temperature to 400℉.
For jumbo muffins, bake for an additional 15-18 minutes. For regular muffins, bake for an additional 11-14 minutes. For either, you want a toothpick inserted in the center to come out clean with no wet batter.
Notes
Measure the flour correctly (using a scale is best, otherwise, use the fluff, scoop, and level method) and don't over-mix the batter.Grease the muffin tin wells if you do not have or plan to use liners.Store lightly covered (with some air circulating), at room temperature for up to 4 days.