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1
Set oven to 350.
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2
Butter and flour an 8 x 8-inch metal baking pan.
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3
For the streusel: in a bowl combine chocolate chips, brown sugar, walnuts and 1 tablespoon cinnamon until well blended; set aside.
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4
For the cake: in a bowl, sift together the the flour, baking soda, baking powder and salt.
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5
Using an electric mixer, beat the sugar, softened butter, vanilla and egg in a large bowl until smooth.
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6
Add in the mashed banana and buttermilk; mix until combined.
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7
Add in the flour mixture and blend well.
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8
Spread about 2 cups of batter into prepared baking pan.
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9
Sprinkle with half of the streusel mixture.
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10
Top with remaining batter, then with streusel mix on top.
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11
Bake for about 45 minutes, or until cake tests done.
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12
Cool cake in pan on a rack.
