Bakery-Style Blueberry Streusel Muffins

Ingredients

For the Streusel Topping:

• 1/2 cup All-purpose flour

• 1/2 cup Granulated sugar

• 1/4 cup Unsalted butter (cold and cubed)

• 1/4 tsp Cinnamon (optional)

For the Muffin Batter:

• 2 cups All-purpose flour

• 1/2 cup Granulated sugar

• 2 tsp Baking powder

• 1/2 tsp Salt

• 1/2 cup Whole milk

• 1/2 cup Sour cream (or Greek yogurt for moisture)

• 1/2 cup Vegetable oil (or melted butter)

• 1 Large egg

• 1 tsp Vanilla extract

• 1 1/2 cups Fresh or frozen blueberries (do not thaw if frozen)

 Step-by-Step Instructions

1. Prep the Oven and Pan 

• Preheat your oven to 400°F (200°C).

• Line a 12-cup muffin tin with paper liners (tulip liners work best for that tall, bakery look!).

2. Make the Streusel 

• In a small bowl, mix the flour, sugar, and cinnamon.

• Add the cold, cubed butter. Use a fork or your fingers to mash the butter into the dry ingredients until it looks like coarse crumbs.  Set aside in the fridge.

3. Mix Dry Ingredients 

• In a large bowl, whisk together the 2 cups flour, sugar, baking powder, and salt.

• Pro Tip: Toss the blueberries in 1 tablespoon of this flour mixture. This prevents them from sinking to the bottom! 

4. Mix Wet Ingredients 

• In a separate medium bowl, whisk the egg, milk, sour cream, oil, and vanilla until smooth.

5. Combine 

• Gently pour the wet ingredients into the dry ingredients.

• Use a spatula to fold them together until just combined.  Do not overmix; the batter should be thick and slightly lumpy.

• Gently fold in the floured blueberries.

6. Fill and Top 

• Scoop the batter into the muffin liners, filling them nearly to the top.

• Generously sprinkle the chilled streusel topping over each muffin.  Press down lightly so it sticks.

7. Bake 

• Bake for 18–22 minutes, or until a toothpick inserted into the center comes out clean.

• Let them cool in the pan for 5 minutes before moving to a wire rack.

 Common Questions (Q&A)

Q: Why did my muffins come out tough? A: This usually happens from overmixing the batter. Once the flour is added, stir only until the white streaks disappear. 

Q: Can I use frozen berries? A: Yes! Just don’t defrost them first, or they will bleed purple juice into your entire muffin. Add them straight from the freezer. 

Q: How do I get those high, domed tops? A: Starting at a higher temperature (like 400°F) creates a “burst” of steam that lifts the batter quickly before the crust sets.