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Easy & Delicious Buttermilk Blueberry Breakfast Cake

Remember those lazy weekend mornings? The ones where the sun is just starting to peek through the curtains, the coffee is brewing, and the house is quiet? That's the feeling this Buttermilk Blueberry Breakfast Cake brings me. It's not fancy, it's not complicated, but oh my goodness, is it utterly perfect. It's the kind of cake that feels like a warm hug, bursting with juicy blueberries and bright lemon, all wrapped up in a tender, moist crumb. Trust me, once you bake this, it'll become a staple in your kitchen for those moments you want something truly special, without any fuss.
Print Recipe Pin Recipe
Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Course: Baked Goods, Breakfast
Ingredients Equipment Method Notes

Ingredients
  

  • 1/2 cup unsalted butter softened, at room temperature
  • 1 lemon zest from 1 large lemon
  • 1 cup granulated sugar plus 1 tablespoon for sprinkling on top
  • 1 large egg at room temperature
  • 1 tsp vanilla extract
  • 2 cups all-purpose flour divided (1¾ cups for batter, ¼ cup for blueberries)
  • 2 tsp baking powder
  • 1 tsp kosher salt
  • 2 cups fresh blueberries
  • 1/2 cup buttermilk

Equipment

  • Large bowl
  • Electric Mixer
  • Medium bowl
  • Spatula
  • 8 or 9-inch square baking pan
  • Wire rack

Method
 

  1. Step 1: Get Started! First things first, let's preheat your oven to 350ºF (175ºC). While it's warming up, grease an 8 or 9-inch square baking pan. Butter or baking spray works perfectly here to make sure your beautiful cake doesn of stick!
  2. Step 2: Cream the Wet Ingredients. In a large bowl, using an electric mixer (or some good old-fashioned elbow grease and a whisk!), cream together your softened butter, the bright lemon zest, and most of the sugar (that's the full cup minus the one tablespoon we saved for later). Beat this until it's light and fluffy, scraping down the sides of the bowl as needed. This should take a few minutes.
  3. Step 3: Add the Egg and Vanilla. Once the butter and sugar mixture is light and airy, add in your room temperature egg and the vanilla extract. Beat them into the mixture until everything is just combined and looks smooth.
  4. Step 4: Prep the Dry Ingredients. In a separate medium bowl, grab your beautiful fresh blueberries. Toss them gently with that reserved ¼ cup of all-purpose flour. This little trick helps prevent the blueberries from sinking to the bottom of your cake while it bakes! In another medium bowl, whisk together the remaining 1¾ cups of flour, the baking powder, and the kosher salt. Give it a good whisk to make sure everything is evenly distributed.
  5. Step 5: Start Combining. Now we'll start adding the dry and wet ingredients to the butter mixture. Add about half of the whisked flour mixture to your bowl and stir it in on low speed, or by hand with a spatula, just until it's incorporated. Don't overmix here!
  6. Step 6: Add the Buttermilk. Pour in all of your buttermilk and stir it into the batter. It might look a little curdled or separated at this point, but don't worry, that's totally normal!
  7. Step 7: Finish the Flour. Add the remaining half of the flour mixture to the batter. Stir just until the flour disappears and everything is combined. Again, be careful not to overmix! A few small lumps are okay.
  8. Step 8: Fold in the Blueberries. Gently fold in those floured blueberries. Use a spatula and be careful not to crush them. Distribute them as evenly as you can throughout the batter.
  9. Step 9: Bake! Pour the batter into your prepared baking pan and spread it out evenly. Now, remember that tablespoon of sugar we saved? Sprinkle it right over the top of the batter. This creates a lovely, slightly crisp, and sparkly crust as it bakes!
  10. Step 10: The Waiting Game (and the best part!). Pop the pan into your preheated oven. Bake for 35 to 45 minutes. The time will vary depending on your oven, so start checking around 35 minutes. You'll know it's done when a toothpick inserted into the center of the cake comes out clean. The top should be golden brown and the cake should look set.
  11. Step 11: Cool. Once it's out of the oven, let the cake cool in the pan on a wire rack for at least 15 minutes before slicing into it. This lets the cake set up properly. It’s delicious warm, but letting it cool slightly makes it much easier to slice.

Notes

Substitutions & Additions: You can swap fresh blueberries for other berries like raspberries or blackberries (toss with flour). For dairy-free, try plant-based butter and homemade dairy-free buttermilk (milk + lemon juice/vinegar). Add extra lemon zest or a tablespoon of lemon juice for more brightness. Chopped walnuts or pecans can add crunch.
Tips for Success: Ensure butter and egg are at room temperature for best emulsification. Measure flour correctly by spooning it into the cup and leveling. Avoid overmixing the batter once flour is added to prevent toughness; small lumps are okay. Flour the berries to prevent them from sinking. Check for doneness with a toothpick; a clean toothpick means it's ready.
How to Store It: Best enjoyed the day it's baked. Store loosely covered at room temperature for 1-2 days. For longer storage, wrap slices individually and store in an airtight container in the fridge for up to 4 days or freezer for 2-3 months. Thaw at room temperature or gently warm.
FAQs: Yes, use frozen blueberries without thawing, tossing them with flour; baking time might be slightly longer. Make a buttermilk substitute with ½ cup milk + 1 tbsp white vinegar or lemon juice, let sit 5-10 mins. Yes, you can bake this cake a day in advance. Room temperature butter is soft but not melty; room temperature egg is not cold to the touch (can warm in warm water 5-10 mins).