Preheat the oven to 350°F. Grease a 9×5-inch loaf pan with butter or oil spray. Set aside.
Whisk the flour, baking soda, salt, clove, and cinnamon together in a large bowl.
2 cups All-purpose flour, 1½ teaspoon Baking soda, ¼ teaspoon Salt, ½ teaspoon Clove, 1½ teaspoon Cinnamon
Using a stand mixer fitted with the whisk attachment beat the butter, oil, and brown sugar together on high speed until smooth and creamy, about 2 minutes.
¼ cup Oil, ½ cup Butter, 1 cup Light or dark brown sugar, packed
On medium speed, add the eggs one at a time, beating well after each addition. Beat in the sour cream, mashed bananas, and vanilla extract on medium speed until combined.
1½ cup Mashed bananas, 2 Large eggs, ⅓ cup Sour cream, 1 tablespoon Vanilla extract
With the mixer running on low speed, slowly beat the dry ingredients into the wet ingredients. Do not overmix. Fold in the nuts.
1 cup Chopped pecan
Pour the batter into the prepared and bake for 60-65 minutes. Tent cover the bread with aluminum foil after 30 minutes to prevent the bread from getting too brown. Remove from the oven and allow the bread to cool completely in the pan, then transfer to the cooling rack.