Preheat oven to 375 degrees fahrenheit.
In a stand mixer or large bowl, beat together butter and sugar until creamy, about one minute.
Add in both eggs and vanilla and mix.
Add baking soda and salt to the wet ingrediets, and mix.
Add in the flour, and mix until just blended.
Add in the two peeled bananas (the browner the better!) and your sour cream or yogurt. Mix until combined (some banana lumps may remain)
Add in mix ins (chocolate chips, blueberries, etc) and stir with a spoon until combined.
Rub the inside of a loaf pan with one tablespoon of butter. I usually just use clean, washed hands to do this. Make sure the bottom, sides, and edges are well covered.
Pour 1/4 sugar into the bottom of the pan.
Gently rotate the pan, tapping as you go, until the sugar has covered the butter in the bottom and sides of the pan.
This will keep your bread from sticking to the pan after it is baked.
Pour your banana bread batter into the sugared pan.
In a small bowl, combine cinnamon and remaining 1/4 cup of sugar.
Mix until well combined.
Using a spoon, sprinkle the topping onto the top of the banana bread batter in the pan. It will look like a lot, but trust me, it's going to be amazing.
Bake at 375 for 45 minutes. Check the center of the loaf with a toothpick at the 45 minute mark. If it comes out wet, cook for an additional 15 minutes. If it comes out clean, your bread is ready!
Allow to cool for at least thirty minutes before removing from the pan.
Serve and enjoy!