• Before you start, preheat the oven to 350 degrees Fahrenheit (180 degrees Celsius). Line a large 9X5-inch loaf pan with parchment paper, leaving enough overhang so you can pull the banana bread out of the pan.

Streusel

• Whisk flour, granulated sugar, and brown sugar together in a small bowl. Stir in the melted butter until there are moist, pea-sized pieces and no dry patches of flour.
  45 grams all purpose flour, 42 grams granulated sugar, 32 grams brown sugar, 35 grams unsalted butter
• Place the streusel in the refrigerator to chill while you make the banana bread batter.

Banana Bread

• Mash brown bananas in a large bowl with a fork or potato masher. They can be smooth or a little lumpy.
  450 grams bananas
• Whisk the oil, granulated sugar, brown sugar, eggs, vanilla, and vinegar into the mashed bananas until well combined.
  112 grams oil, 150 grams granulated sugar, 50 grams dark brown sugar, 2 large eggs, 2 teaspoons vanilla extract, 1 tablespoon white vinegar
• Add the flour, baking powder, baking soda, salt, and cinnamon. Fold into the wet ingredients with a rubber spatula until just combined.
  240 grams all purpose flour, ½ teaspoon baking powder, 1 teaspoon baking soda, 1 teaspoon salt, 1 teaspoon ground cinnamon
• Pour the batter into the prepared pan. Generously sprinkle streusel on top.
• Bake for 60-70 minutes or until a toothpick inserted in the center comes out clean and the topping is golden brown.
• Let the banana bread cool in the hot pan for 10 minutes. Then carefully pull it out of the pan and transfer to a wire rack to cool completely for about 30 minutes.
• Slice and enjoy!