Choc Chip/ Banana Coffee Ck.

Recipe is from 3 B's blog:

1 cup cinnamon (or butterscotch or chocolate) chips
2/3 cup (packed) light brown sugar
3/4 cup chopped pecans or walnuts
1 tablespoon ground cinnamon, I left out as I used cinnamon chips
1 1/2 cups all purpose flour
3/4 teaspoon baking soda
3/4 teaspoon baking powder
1/4 teaspoon salt
3/4 cup sugar
1/2 cup (1 stick) unsalted butter, room temperature
1 large egg
about 4 mashed bananas, I used 3 but would have used a 4th if I had it.
3 tablespoons buttermilk
Preheat oven to 350°F.
Butter and flour 8x8x2-inch baking pan. Stir chocolate chips, brown sugar, walnuts, and cinnamon in small bowl until well blended; set streusel aside.
Mix the all-purpose flour, baking soda, baking powder, and salt into medium bowl. Set aside.
Using electric mixer, beat sugar, room temperature butter, and egg in a separate bowl until fluffy. Beat in mashed bananas and buttermilk.
Add dry ingredients and blend well.
Spread half of batter 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.