Lemon Muffins with Streusel Topping

Name: Lemon Muffins with Streusel Topping
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 6 tablespoons unsalted butter (softened); 2 tablespoons vegetable oil; 1 cup granulated sugar; 1/4 cup brown sugar; 2 teaspoons lemon zest (approx. zest of one lemon); 2 teaspoons pure vanilla extract; 1 teaspoon lemon extract; 2 large eggs; 3/4 cup whole milk; 2 and 3/4 cups all-purpose flour; 3 teaspoons baking powder; 3/4 teaspoon salt; 1/4 cup butter (melted); 3/4 cup all purpose flour; 2 tablespoons granulated sugar; 2 tablespoons brown sugar; 1/2 teaspoon lemon extract; 3 tablespoons butter (melted); 1/2 cups confectioners sugar; 2 tablespoons lemon juice