Ingredients
1
1/4 cups semisweet chocolate chips (about 8 ounces)
2/3
cup (packed) golden brown sugar
1
1/2 cups all purpose flour
1/2
cup (1 stick) unsalted butter, room temperature
1
1/3 cups mashed very ripe bananas (about 3 large)
Directions
1.
Preheat oven to 350°F. Butter and flour 8x8x2-inch metal baking pan. Stir chocolate chips, brown sugar, walnuts, and cinnamon in small bowl until well blended; set streusel aside. Sift all purpose flour, baking soda, baking powder, and salt into medium bowl. Using electric mixer, beat sugar, room temperature butter, and egg in large bowl until fluffy. Beat in mashed bananas and buttermilk. Add dry ingredients and blend well.
2.
Spread half of batter (about 2 cups) in prepared baking pan. Sprinkle with half of streusel. Repeat with remaining batter and streusel. Bake coffee cake until tester inserted into center comes out clean, about 45 minutes. Cool coffee cake in pan on rack.
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