Preheat the oven to 350 degrees F (175 degrees C). Grease two 9x5-inch loaf pans.
Mix mashed bananas and yogurt together in a bowl.
Combine butter, white sugar, and brown sugar in a large bowl; beat using an electric mixer until creamy. Add eggs and vanilla extract and stir to combine. Add banana mixture and mix well.
Stir flour, oat flour, rolled oats, baking soda, baking powder, and salt together in a bowl. Add to the banana-butter mixture and stir just until combined. Don't overmix. Fold chocolate chips and walnuts into the batter. Divide batter between the prepared pans.
Bake in the preheated oven until a knife inserted into the center comes out clean, 50 to 60 minutes. Remove from the oven and cover loosely with aluminum foil for 5 minutes. Remove from the pans and allow to cool completely.
Nutritional Facts
Per 16 servings
Calories: 372
Carbohydrate: 48g
Fat: 19g
Fiber: 3g
Protein: 6g
Sugar: 24g
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