Preheat your oven to 350°F (175°C). Grease and line a 9x5-inch loaf pan with parchment paper.
Mash the Bananas
In a bowl, mash the ripe bananas until smooth with only small lumps remaining.Very ripe bananas work best because they are sweeter and provide better moisture.
Mix the Wet Ingredients
In a large bowl, whisk together:• room temperature butter• granulated sugar• brown sugarAdd the eggs one at a time, mixing well after each addition.Stir in the mashed bananas and vanilla extract.
Combine Dry Ingredients
In another bowl, whisk together:• flour• baking soda• salt• cinnamon
Combine the Batter
Add the dry ingredients to the banana mixture and stir gently until just combined.Fold in the sour cream or Greek yogurt to create a soft, moist batter.If desired, fold in chopped nuts or chocolate chips.
Bake the Loaf
Pour the batter into the prepared loaf pan and smooth the top.Bake for 50–60 minutes, or until a toothpick inserted in the center comes out clean.Your kitchen will smell incredible while this banana loaf cake bakes.
Cool the Cake
Allow the cake to cool in the pan for 10–15 minutes, then transfer it to a wire rack to cool completely.Cooling allows the crumb to set and keeps the cake from breaking.