Preheat your oven to 350°F and prep a standard 9-inch loaf pan by lining it with parchment paper or spraying it with cooking spray.
Melt the butter in a small pot on the stove over low heat or in a microwave-safe bowl in 20-second intervals, stirring in between, until completely liquefied.
½ cup unsalted butter, melted
Peel your bananas and add them to a large mixing bowl. Use a fork to mash the bananas until they are almost liquefied (some lumps are okay!)
2 large bananas
Add the butter, sugar, and vanilla extract to the mashed banana and use a whisk or fork to combine.
1 cup light brown sugar, 1 teaspoon vanilla extract
Then, add the flour, cinnamon, baking soda, and salt and combine until smooth. Use a rubber spatula to scrape down the sides as needed.
1 ½ cups all-purpose flour, 2 teaspoons cinnamon, 1 teaspoon baking soda, 1 teaspoon salt
Chop both ends off the zucchini and use a cheese grater or food processor to shred it. 1 large shredded zucchini
Gently fold the zucchini into the batter. Do not overbeat the batter.
Transfer the batter into your prepped pan, ensuring there is at least 2 inches of space left on the top.
Bake for 55-65 minutes on the top rack until a toothpick comes out clean. Allow to cool completely before slicing. Enjoy!