Have all ingredients at room temperature. Position a rack in the lower third of the oven. Preheat the oven to 350° F. Butter a 9x5-inch loaf pan, and set aside.
Whisk the dry ingredients (flour through baking powder) together in a medium bowl. Set aside.
In a large bowl, cream the butter and sugar together using a sturdy fork or in a Kitchen-aid until it’s lightened in color and texture. Mix in the flour mixture until well blended and the consistency of brown sugar. Gradually beat in the eggs.
Fold in the mashed bananas, walnuts, and bourbon. Scrape the batter into the pan and spread evenly. Bake at 350° F for 50-60 minutes, or until a toothpick inserted in the center comes out clean. Let cool in the pan on a wire rack for 5 – 10 minutes before unmolding to cool completely.
Makes a 9x5 loaf, or 8 servingsAdapted from Joy of CookingIf you'd like a stronger bourbon flavor, double the amount of bourbon. The recipe gives a great flavored balanced banana bread, but if you're looking for a hit of bourbon, double it.