Let the bacon cool, then roughly chop.
In a medium-sized bowl, sift together the flour, baking soda, and salt; set aside.
Using a spoon, in a large mixing bowl mix together the melted butter and the mashed bananas.
Mix in the beaten egg, sugar, peanut butter and vanilla.
Continue to stir with the spoon while gradually adding in the flour mixture; mix until well incorporated.
Fold in the chopped candied bacon.
Pour mixture into a greased 4x8-inch loaf pan.
Bake for 55 to 60 minutes, or until a toothpick inserted in the center comes out clean.
Cool, then remove it from the pan to serve.