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close up of blueberry cake

Sour Cream Blueberry Coffee Cake

Course: Dessert
Cuisine: American
Prep Time: 30 minutes
Cook Time: 50 minutes
Servings: 15 servings
Calories: 485kcal
Author: Kara Jane @ I Scream for Buttercream
This sour cream blueberry coffee cake is super moist and flavorful with a pound cake like texture and filled with yummy blueberries, then topped with the most amazing crumb streusel topping.
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Ingredients

For the crumb topping:

  • 3/4 cup packed brown sugar
  • 1 cup all purpose flour
  • 1 1/2 tsp cinnamon
  • 1/2 tsp salt
  • 1/2 cup cold unsalted butter, cut into small chunks

For the cake:

  • 3 cups all purpose flour
  • 3 tsp baking powder
  • 1 tsp salt
  • 1 cup granulated sugar
  • 2/3 cup packed brown sugar
  • 1 cup sour cream
  • 1/2 cup milk
  • 3 eggs
  • 2 tsp vanilla extract
  • juice and zest from 1 lemon
  • 1 cup unsalted butter, room temperature (2 sticks)
  • 3 1/2 cups frozen blueberries, not thawed (if using fresh blueberries, see notes below)

Instructions

For the crumb topping:

  • Add the brown sugar, flour, cinnamon and salt to a mixing bowl and whisk well. Pull out any brown sugar chunks. Add the chunks of butter and mix with a fork and your fingers smashing the butter as you go. Once all the chunks of butter are broken up and mostly incorporated, you can use the fork or an electric mixer to mix it just until the mixture is crumbly.
  • If using a mixer, be careful not to mix too long, or it will form a paste. Stop mixing once the mixture looks crumbly.
  • Cover the bowl with plastic wrap and place in the fridge to chill while you make the cake.

For the cake:

  • Preheat oven to 350 degrees Fahrenheit.
  • Grease a 9x13 inch pan. (I used a glass pan). If you're using a dark coated pan, the bottom may over-brown a bit, so just be aware.
  • In a large mixing bowl, whisk together the flour, baking powder, salt, granulated sugar and packed brown sugar. Whisk well and set aside.
  • In another bowl, mix together the sour cream, milk, eggs, vanilla extract and juice and zest from one lemon. Whisk well and set aside.
  • Make sure your butter is slightly cooler than room temperature. Add the butter (in chunks) slowly to your dry ingredients. (You can turn your stand mixer on low and leave it on while you add the butter chunks a bit at a time, or you can use a hand mixer.)
  • Once all the butter has been added, turn the mixer up to medium and mix until all the flour is coated with the butter and the mixture is crumbly. It will have a sand-like texture.
  • Pour in about half of the liquid mixture. Mix on medium until just combined. About 15-20 seconds.
  • Pour the last of the liquid mixture and mix again until combined. Don't over mix the batter. Mixing it for several minutes is too long. Once all the ingredients are incorporated well, stop mixing.
  • Use a rubber spatula and scrape the sides of the bowl. Mix again for only about 10 seconds.
  • Add a couple teaspoons of flour to the frozen blueberries a stir to coat them.
  • Add the flour coated frozen blueberries to the cake batter and stir in with a wooden spoon or rubber spatula, not with the electric mixer.
  • Pour the batter into prepared pan. If you use frozen blueberries, the batter will become quite thick and possibly a little stiff. It's okay, just spread it evenly into the pan as best you can.
  • Sprinkle the crumb mixture evenly over the top of the cake batter.
  • Bake at 350 degrees for approximately 50-55 minutes. The top will be golden brown and a toothpick inserted into the center will come out either clean or with a few moist crumbs. (I used frozen blueberries. If you use fresh blueberries, you may not need to bake as long. Watch your cake closely after about 40 minutes.)
  • Set on wire rack to cool for at least 30 minutes, then serve straight from the pan. This cake is best served warm.

Video

Notes

This coffee cake makes enough batter for a 9x13 inch pan. If you want a small coffee cake, you can make half the batter and just add it to an 8x8 inch pan.
This cake is best served warm. Store leftovers in the fridge and heat for about 15 seconds in the microwave before serving.
I used frozen blueberries. If you use fresh blueberries, you may not need to bake as long. Watch your cake closely after about 40 minutes.
Nutritional values are an estimate.
Make sure to check out the TIPS & FAQs for this recipe in the blog post, which may answer questions about substitutions.
*This recipe card may contain affiliate links. As an Amazon Associate, I earn from qualifying purchases.

Nutrition

Calories: 485kcal | Carbohydrates: 66g | Protein: 6g | Fat: 23g | Saturated Fat: 14g | Cholesterol: 90mg | Sodium: 271mg | Potassium: 239mg | Fiber: 2g | Sugar: 38g | Vitamin A: 742IU | Vitamin C: 3mg | Calcium: 106mg | Iron: 2mg