1-Preheat your oven: Preheat your oven to 400°F (200°C) right at the start to ensure everything goes smoothly.

2-Line muffin pan: Start by lining a muffin pan with cupcake liners to avoid any sticking issues.

3-Mix dry ingredients: In a large bowl, whisk together 2 cups flour, 1 cup sugar, 2 teaspoons baking powder, and ½ teaspoon salt until well combined.

4-Mix wet ingredients: In another bowl, whisk 2 eggs until smooth, then add ½ cup melted butter, ½ cup milk, and 1 teaspoon vanilla; whisk until everything is mixed.

5-Combine wet and dry: Pour this wet mixture into the dry ingredients and stir just until combined remember, keeping the batter lumpy helps make the muffins nice and tender.

6-Fold in blueberries: Gently fold in 2 cups of blueberries to distribute them evenly without crushing them.

7-Prepare streusel topping: For the streusel topping, in a separate bowl, combine ¼ cup flour, 2 tablespoons packed brown sugar, 2 tablespoons granulated sugar, ¼ teaspoon cinnamon, and 1/8 teaspoon salt. Use a pastry cutter to mix in 2 tablespoons of cold butter until it resembles coarse crumbs.

8-Fill muffin cups and bake: Fill the muffin cups with batter, sprinkle about 1 tablespoon of streusel on each, and briefly bake for 18-22 minutes, or until a toothpick comes out clean with a few moist crumbs.

9-Cool muffins: Let them cool in the pan for a bit before moving to a wire rack.