Coffee Cake Muffins

Ingredients

• 2 cups all-purpose flour
• 1 cup granulated sugar
• 1/2 cup unsalted butter, melted
• 1 tablespoon baking powder
• 1/2 teaspoon salt
• 1 teaspoon ground cinnamon
• 1/2 cup whole milk
• 2 large eggs
• 1/2 teaspoon vanilla extract
• For the streusel topping:
• 1/2 cup all-purpose flour
• 1/2 cup brown sugar, packed
• 1/4 cup unsalted butter, cold and cut into small pieces