Banana Nut Bread

I've tried several different banana bread recipes, and this one surpassed the rest! I think I found it out of a magazine...

2c flour
1 1/2tsp baking powder
1/2tsp baking soda
1/2tsp ground cinnamon
1/4tsp salt
1/4tsp ground nutmeg
1/8tsp ground ginger
2 eggs, lightly beaten
1 1/2c mashed banana (4-5 medium-very ripe)
1c sugar
1tsp vanilla
1/2c butter
1/4-1/2c walnuts

Streusel-nut topping:
1/4c brown sugar
3T. flour
2T butter (stick is better for this)
1/3c walnuts, chopped

Preheat oven to 350 degrees. Grease loaf pan. In large bowl combine flour, baking powder, baking soda, cinnamon, salt, nutmeg, and ginger. Make a well in the center. In a medium bowl combine eggs, banana, sugar, vanilla and butter. Add this mixture to flour mixture. Stir just until moistened. Fold in walnuts. Spoon batter into pan. Make topping: In small bowl combine brown sugar and flour. Cut in butter until mixture is coarse crumbs. Stir in walnuts. Sprinkle topping onto batter. Bake 55-60 minutes (foil on top for the last 15). Cool on wire rack 10min. Remove from pan and cool completely on rack. Wrap and store overnight before slicing.