CRUMB TOPPING:
2 tablespoons packed brown sugar
scant 3 Tablespoons all-purpose flour
1 tablespoon unsalted butter -- cut into pieces
2 tablespoons toffee bits -- (2 to 3)
1/4 teaspoon cinnamon -- optional
approx. 1/4 t. fresh ground nutmeg -- optional
CAKE:
1 1/4 cups plus 2 T. all-purpose flour
1 1/4 teaspoons baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt
3 tablespoons unsalted butter -- softened
3/4 cups granulated sugar
1 large egg plus 1 large egg white
1 teaspoon pure vanilla extract
1/4 cup low-fat buttermilk
1/2 cup sour cream
1 smashed over-ripe banana (1/3 to 1/2 cup)
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