• Preheat your oven to 350°
• Prepare your baking pan by spraying it with nonstick cooking spray and lightly coating with all-purpose flour.
• In the medium mixing bowl, whisk together the flour, baking soda, salt, and cinnamon until thoroughly combined and set aside.
• Peel the four bananas and place them into the large mixing bowl. Mash the bananas, either with a masher or a fork, until only small lumps remain.
• To the mashed bananas, add the brown sugar and canola oil and mix with a spatula until well combined. Stir in vanilla extract.
• In small batches, add the dry ingredient mixture to the wet. The key here is to mix only just until no flour visibly remains. Do not overmix!
• Once the batter has just come together, add in chocolate chips or nuts, if using.
• Pour the batter to your prepared baking pan and bake on the center rack of the oven for 55-65 minutes, or until a toothpick inserted into the center of the bread comes out clean.
• Let cool in the pan for ten minutes before removing the bread from the pan and transferring to a wire cooling rack. Wait until the bread has cooled before drizzling with optional peanut butter glaze.

To Make The Peanut Butter Glaze

• If using the peanut butter glaze, you can prepare it while the bread is baking. Whisk all the glaze ingredients together in a small bowl with a fork until well combined. If you feel it is took thick, add a little more milk. If too thin, add a little more peanut butter. Don't be afraid to play with it until you achieve your preferred consistency.