Preheat the oven to 350 degrees F. Spray an 8x5-inch loaf pan with nonstick spray.
In a large bowl, use an electric mixer to combine the butter and sugar until light and fluffy. Add the eggs; beat until well mixed and creamy.
Sift the dry ingredients into the wet mixture and stir until incorporated. Stir in the bananas and the vanilla. Then stir in half of the chopped candy. Scrape into the prepared loaf pan and top with the remaining chopped Snickers.
Bake 50 to 60 minutes or until a toothpick inserted into the center comes out clean.