Preheat oven to 325 degrees. Prepare two loaf pans by spraying with nonstick baking spray, or lining them with parchment paper. Set aside.
Mash bananas in an electric mixer mixing bowl with the paddle attachment or using a fork.
Add vanilla, eggs, brown sugar, yogurt, and oil to the bananas. Mix on medium spped until creamed.
Add baking soda, salt, and ground cinnamon. Beat until combined.
Add flour and beat on low speed just until the flour is incorporated. It's okay if there are still a few streaks of flour.
Stir in extra flavor add-ins, like chocolate chips, chopped walnuts, etc. Add-ins are optional.
Divide the banana bread batter evenly between the two prepared loaf pans. Sprinkle with extra cinnamon sugar if you'd like!
Bake bread for 40-45 minutes. Insert a toothpick in the center of the bread until it comes out with only a few moist crumbs. Or, test the doneness with an instant-read thermometer. The internal temperature of the bread should be 200-205° F.
Remove from the oven and let it rest for about 5 minutes in the bread pan. Remove from the bread pans and completely cool on a baking rack before slicing or storing.