Banana Coffee Cake with Chocolate Chip Streusel

I had a couple of very ripe banana's so was looking for a great bar/slice recipe, and came across this delight on http://www.lovintheoven.com/ ! This girl is amazing! And so are these bars!! The only thing I altered was I only used 2 banana's instead of the 4 in the recipe. I only had 2, but I also find things can get a bit mushy with so much banana...stil had a nice banana taste though!!

• 1 cup chocolate chips
• 2/3 cup (packed) golden brown sugar
• 1/2 cup chopped walnuts
• 1 tablespoon ground cinnamon

• 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
• 3 tablespoons buttermilk

1. Preheat oven to 350°F.
2. Butter and flour 8x8x2-inch baking pan. Stir chocolate chips, brown sugar, walnuts, and cinnamon in small bowl until well blended; set streusel aside.
3. Mix the all-purpose flour, baking soda, baking powder, and salt into medium bowl. Set aside.
4. Using electric mixer, beat sugar, room temperature butter, and egg in a separate bowl until fluffy. Beat in mashed bananas and buttermilk.
5. Add dry ingredients and blend well.
6. Spread half of batter in prepared baking pan. Sprinkle with half of streusel. Repeat with remaining batter and streusel.
7. Bake coffee cake until tester inserted into center comes out clean, about 45 minutes. Cool coffee cake in pan on rack.