Banana Blueberry Loaf

This is a delicious recipe for banana blueberry loaf.
The quantities given below make two loaves, and they freeze beautifully, so I'm keeping one in the freezer for Easter afternoon tea. I might even make another batch soon as I know we'll be having plenty of visitors.

Ingredients
1 cup butter, softened(or 1/2 cup butter and 1/2 cup margarine)
2 cups sugar
4 eggs
1 1/2 teaspoons vanilla
3 cups mashed (with a fork) ripe bananas (about 6)
2 1/2 cups all-purpose flour
2 teaspoons baking soda
1 teaspoon salt
1 teaspoon nutmeg
1/2 teaspoon cinnamon (optional)
1 1/2 cups blueberries (fresh or frozen)

Directions

1. Set oven to 180C.
2. Grease two 8x4-inch loaf pans.
3. In a bowl, cream the butter and sugar until fluffy and the sugar granules have dissolved.
4. Add in eggs, and beat well.
5. Add in the vanilla and mashed bananas; mix with a wooden spoon to combine.
6. Sift together the flour, baking soda, salt, nutmeg and cinnamon (if using).
7. Add in the flour mixture to the creamed mixture; mix only to combine (be sure not to over mix or your cake will be tough!).
8. Fold in the blueberries, then mix to combine.
9. Divide the mixture between the two prepare baking pans.
10. Bake for 50-60 minutes, or until a toothpick inserted in the middle comes out clean.