Banana Coffee Cake with Chocolate Chip Streusel

It’s time for another delicious breakfast food! I’ve been eating this for the last few days (it lasts well!), and it’s actually surprisingly filling. I make it past 9:05 am without wondering when second breakfast is, which is practically unheard of!

If you don’t have buttermilk, and don’t want to buy it for a recipe that just uses a few spoonfuls, remember that you can make buttermilk by adding lemon juice to milk and letting it curdle for 5 minutes. The generally accepted measurements are just under 1 cup of milk to 1T lemon juice (or white vinegar), but, since I didn’t need that much, I just sorta …winged it? wung it? Guesstimated with less milk, and it came out tasting fine.

Begin by greasing and flouring an 8X8″ pan. Make the streusel by just mixing the ingredients together, and then set it aside. You could use chocolate chips and walnuts, but that’s gross so I just used even more chocolate.

Mm, sugary!

Mix the flour, baking soda, baking powder, and salt in a bowl and set that aside as well.

It’s then time to mash your bananas, and, yes, set that aside too.

Way easier than potatoes!

Beat together the egg, sugar, and butter until light and fluffy, and then beat in the bananas and buttermilk.


Beat the flour mixture in until well mixed.

Spread half the batter in your pan and smooth out.

Sprinkle half the streusel on top.

Repeat with the other halves, and then bake for 45 minutes.

Cool in the pan, and then eat the heck out of this!

Banana Coffee Cake with Chocolate Chip Streusel

Adapted from Lovin’ From the Oven.


  • 1 cup chocolate chips
  • 2/3 cup packed brown sugar
  • 1/2 cup chopped walnuts/more chocolate chips
  • 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
  • 4 mashed bananas
  • 3 tablespoons buttermilk

Preheat oven to 350°F. Butter and flour 8×8 baking pan.

Stir chocolate chips, brown sugar, cinnamon, and walnuts if using; set aside.

Mix the flour, baking soda, baking powder, and salt into medium bowl. Set aside. Mash bananas and set aside as well.

Using electric mixer, beat sugar, room temperature butter, and egg in a large bowl until fluffy. Beat in mashed bananas and buttermilk.  Add flour mixture 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.


About sparecake

My name's Corinne, and I like cake, cookies, and chocolate! Also, non-c-things such as ponies, Star Trek, and biking. I write a food blog and a blog about life, wide open spaces, and museum work. Nice to meet you!
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2 Responses to Banana Coffee Cake with Chocolate Chip Streusel

  1. Danielle says:

    Clabbered milk! I just learned this word the other day. It feels suspicious & wrong to purposefully ruin milk, but apparently it works?

    • sparecake says:

      Yeah, you would think citrus+dairy would be a bad plan, but it works!
      I used to put whipped cream on orange juice, like a creamsicle. It was delicious but consistently made you feel ill after because it curdled. Blarf.

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