1 1/2 cups all-purpose flour
1 tsp baking soda
1/4 t cinnamon
1/2 teaspoon salt
2 large eggs at room temperature for 30 minutes
1 cup sugar
1/2 cup vegetable oil
3 very ripe bananas, coarsely mashed
2 tbsp Greek yogurt
1 tsp vanilla extract
1/2 cup peanut butter chips, plus 2 tbsp additional, separated
Preheat oven to 350°F. Spray a 9x5x3 metal loaf pan with nonstick cooking spray.
Combine flour, baking soda, cinnamon, and salt.
Beat together eggs and sugar in bowl of electric stand mixer (or use a handheld mixer) at medium-high speed until very thick, pale and creamy, about 5 minutes. Reduce speed to low and add oil in a slow stream, mixing, then mix in bananas, sour cream, and vanilla extract. Fold in flour mixture and peanut butter chips.
Pour batter into the pan, spreading evenly. Top with 2 tbsp additional peanut butter chips. Bake in middle of oven until golden brown and a toothpick comes out clean, about 55-60 minutes.