Preheat oven to 350F.
With a hand blender or mix master blend butter and sugar together. Add eggs, vanilla and mix. Add mashed banana.
In a separate bowl, use a fork to mix flour, baking soda, baking powder, walnuts and sea salt.
Fold in ingredients of first bowl with mashed banana. Do not over mix.
Use non-stick spray on a standard size loaf pan (8-1/2 x 4-1/2 x 2-1/2 inches). Add banana bread ingredients.
Bake for 1 hour, or until you can insert a toothpick and it comes out clean.
Let cool for at least 10 minutes before removing from pan.
Nutrition Information: YIELD: 12 servings SERVING SIZE: 1 Amount Per Serving: CALORIES: 316TOTAL FAT: 15gSATURATED FAT: 6gTRANS FAT: 0gUNSATURATED FAT: 9gCHOLESTEROL: 51mgSODIUM: 227mgCARBOHYDRATES: 42gFIBER: 2gSUGAR: 23gPROTEIN: 5g