Blueberry Buttermilk Coffee Cake

Written by Beth - Budget Bytes

I did a bad thing. I’m trying to be all good and healthy, but I accidentally made this Blueberry Buttermilk Coffee Cake this morning. Oops. Sorry (not sorry).

This big, fluffy coffee cake is studded with sweet blueberries and topped with a crunchy cinnamon streusel topping. It comes together surprisingly quick, so it would make a nice treat for a slow weekend morning. It’s the little things in life that make it good. :)

Overhead view of casserole dish with Blueberry Buttermilk Coffee Cake, a few pieces cut out and a fork resting in their place.

Can I Substitute the Buttermilk?

If you don’t have buttermilk, you can make a substitute by adding 1 Tbsp lemon juice or white vinegar to each cup of milk. That substitute will function like buttermilk, but if you want true buttermilk flavor, I suggest using actual buttermilk. But don’t worry, you don’t have to waste a whole bottle of buttermilk just to make this recipe.

How to Use Leftover Buttermilk

You can freeze buttermilk! Pour the buttermilk into an ice cube tray, freeze until solid, then transfer to a freezer bag for long term storage. This way you can thaw a few cubes out at a time to use in various recipes without wasting a whole bottle each time! This trick is an absolute lifesaver for anyone who loves the authentic flavor of buttermilk (hi, ME) and doesn’t want to resort to the milk and lemon juice trick.

Can I Freeze Coffee Cake?

Yes! Baked goods are one of those things that freeze surprisingly well. Let the coffee cake cool completely, then wrap each piece tightly in plastic wrap and place all the wrapped pieces in a gallon size freezer bag. When you’re ready to eat your decadent Blueberry Buttermilk Coffee Cake, just take however many pieces out you want and let them thaw on the countertop, or microwave for a few seconds until warmed through.

…And that’s exactly what I need to go do right now before I do eat the whole cake. 😜

Side view of a Blueberry Buttermilk Coffee Cake with pieces cut out so you can see the crumb and juicy blueberries inside

Print Recipe Grocery List Favorites
4.73 from 36 votes

Blueberry Buttermilk Coffee Cake

Blueberry Buttermilk Coffee Cake is a delicious morning treat with its sweet blueberries and crunchy cinnamon streusel topping.
Author: Beth - Budget Bytes
Prep Time: 15 mins
Cook Time: 45 mins
Total Time: 1 hr
Servings: 8



  • 1/4 cup all-purpose flour ($0.04)
  • 1/4 cup brown sugar ($0.16)
  • 2 Tbsp softened butter ($0.18)
  • 1/2 tsp cinnamon ($0.05)


  • 2 cups all-purpose flour ($0.33)
  • 1 Tbsp baking powder ($0.24)
  • 3/4 tsp baking soda ($0.02)
  • 1/4 tsp salt ($0.01)
  • 1/2 cup white sugar ($0.16)
  • 2 large eggs ($0.55)
  • 1 cup buttermilk ($0.60)
  • 1/4 cup melted butter ($0.36)
  • 1/2 cup blueberries (frozen or fresh) ($0.60)


  • Preheat the oven to 350ºF. In a small bowl, combine the ingredients for the streusel topping (flour, brown sugar, softened butter, and cinnamon) until they create a uniform, crumbly topping. Set the topping aside.
  • In a large bowl, stir together the flour, baking powder, baking soda, and salt for the coffee cake batter. In a separate bowl, whisk together the white sugar, eggs, buttermilk, and melted butter until smooth. Pour the bowl of wet ingredients into the bowl of dry ingredients, and stir just until a thick, fluffy batter forms (do not over stir).
  • Coat an 8x8 inch baking dish (or similar size) with nonstick spray. Spread the batter into the dish. Sprinkle the blueberries over top, then push them down into the batter with your fingers. Sprinkle the streusel topping over the top.
  • Bake the coffee cake in the fully preheated 350ºF oven for 40-45 minutes, or until the top is golden brown. Slice into eight pieces, then serve.
See how we calculate recipe costs here.
Tried this recipe?Mention @budgetbytes or tag #budgetbytes on Instagram!


Serving: 1 ServingCalories: 322.61 kcalCarbohydrates: 49.45 gProtein: 6.3 gFat: 11.3 gSodium: 447.46 mgFiber: 1.3 g
Nutritional values are estimates only. See our full nutrition disclaimer here.

The equipment section above contains affiliate links to products we use and love. As an Amazon Associate I earn from qualifying purchases.

Scroll down for the step by step photos!

View of the top of a Blueberry Buttermilk Coffee Cake in a casserole dish

How to Make Blueberry Buttermilk Coffee Cake – Step by Step Photos

Streusel Topping Ingredients in a glass bowl

Preheat the oven to 350ºF. Prepare the cinnamon streusel topping first, so it’s ready to go when needed. In a small bowl, stir together 1/4 cup all-purpose flour, 1/4 cup brown sugar, 2 Tbsp softened butter, and 1/2 tsp cinnamon. (the amounts for the streusel in the photos are double, but I ended up having way more  than needed and only used 1/2 of the batch on the coffee cake. I froze the rest).

Streusel Topping Mixed in the bowl

Stir the streusel topping ingredients until they form a crumbly mixture. Set the topping aside.

Coffee Cake Dry Ingredients in a glass bowl

In a large bowl, stir together 2 cups all-purpose flour, 1 Tbsp baking powder, 3/4 tsp baking soda, and 1/4 tsp salt. Make sure they’re very well mixed.

Coffee Cake Wet Ingredients in a metal mixing bowl

In a separate bowl, whisk together 1/2 cup white sugar, 1 cup buttermilk, 2 large eggs, and 1/4 cup melted butter (4 Tbsp). Whisk until smooth.

Combine Coffee Cake Wet and Dry Ingredients

Now pour those wet ingredients into the bowl of dry ingredients.

Coffee Cake Batter Mixed in a glass bowl with wooden spoon

Stir just until you have a thick and fluffy batter. Do not over stir the batter. It may still look a little lumpy, just make sure all the dry flour is mixed in.

Add Blueberries to Coffee Cake batter in baking dish

Coat the inside of an 8×8 inch baking dish, or similar sized dish, with non-stick spray. Spread the batter evenly inside the dish. Sprinkle 1/2 cup fresh or frozen blueberries over the batter, then push them down in with your fingers.

Add Streusel Topping

Sprinkle that cinnamon streusel topping over the batter. It doesn’t need to cover the batter in a solid layer.

Blueberry Buttermilk Coffee Cake ready to bake

Bake the Blueberry Buttermilk Coffee Cake for 40-45 minutes, or until the top is golden brown…

Blueberry Buttermilk Coffee Cake baked

Like this! Perfect. Now you can slice it into eight pieces and serve with your favorite coffee or tea.

Blueberry Buttermilk Coffee Cake is a morning treat with its sweet blueberries and crunchy cinnamon streusel topping.

. If you DO decide to freeze the extra pieces of your Blueberry Buttermilk Coffee Cake, make sure they are COMPLETELY cool before wrapping them in plastic. Enjoy!

Zoe Posing

Zoe says, “I can haz coffee cake? Trade you some cuddles…”

Blueberry Buttermilk Coffee Cake is a morning treat with its sweet blueberries and crunchy cinnamon streusel topping.
Blueberry Buttermilk Coffee Cake is a morning treat with its sweet blueberries and crunchy cinnamon streusel topping.