Blueberry Streusel Muffins - The BakerMama

Ingredients

• 4 tablespoons unsalted butter, melted
• 1/4 cup granulated sugar
• 1/4 cup light brown sugar
• 1/4 cup all-purpose flour
• 3 cups all-purpose flour
• 1 tablespoon baking powder
• 1 teaspoon kosher salt
• 6 tablespoons unsalted butter, melted
• 1 cup granulated sugar
• 2 large eggs
• 1 teaspoon vanilla
• 1 cup milk
• 2 cups fresh blueberries, divided