1. Preheat and Prep

• Preheat your oven to 375°F (190°C).

• Grease a 9-inch square baking dish or line it with parchment paper.

2. Mix Dry Ingredients

• In a medium bowl, whisk together:

  • 2 cups flour

  • 1½ teaspoons baking powder

  • ½ teaspoon salt

3. Cream Butter and Sugar

• In a separate large bowl, cream:

  • ¼ cup softened butter

  • ¾ cup granulated sugar

• Beat until light and fluffy.

• Add 1 egg and 1 teaspoon vanilla extract, mixing until smooth.

4. Combine Batter

• Gradually add the dry mixture to the wet ingredients, alternating with ½ cup milk.

• Stir just until combined—avoid overmixing.

• Gently fold in 2 cups blueberries.

5. Spread in Pan

• Pour the batter into your prepared dish and smooth the top.

6. Make the Crumb Topping

• In a small bowl, combine:

  • ½ cup brown sugar

  • ⅓ cup flour

  • ½ teaspoon cinnamon

• Cut in ¼ cup chilled, diced butter using a pastry cutter or clean fingers until it forms coarse crumbs.

7. Add Topping and Bake

• Sprinkle the topping evenly over the batter.

• Bake for 35–40 minutes, or until a toothpick inserted into the center comes out clean and the topping is golden brown.