Begin by preheating the oven to 350 degrees Fahrenheit and spraying the inside of a 9x5 inch loaf pan with nonstick cooking spray.
In a large bowl, combine flour, baking powder, cinnamon, baking soda, and salt.
In a separate, medium-sized bowl, combine the eggs, bananas, brown sugar, butter, and bourbon. Tip: Use a potato masher to mash bananas and then a wooden spoon to mix all of the ingredients together.
Add the wet ingredients to the bowl with the flour mixture and beat over medium speed using an electric mixer until the dry ingredients are just incorporated into batter. (The batter will be thick and lumpy.)
Gently stir in the pecans on low speed.
Transfer the batter to your prepared loaf pan, spreading it evenly in the pan.
Bake for 45-50 minutes or until a toothpick stuck into the banana loaf comes out clean. Cool on a wire rack for at least 10 minutes before drizzling with the sour cream bourbon icing.