Cheesecake Streusel Muffins Recipe

Name: Cheesecake Streusel Muffins Recipe
Ingredients: For Muffins:; 8 tablespoons (4 ounces) unsalted butter, softened; 1 cup (7 ounces) granulated sugar; 1/2 teaspoon salt; 2 teaspoons zest from 2 lemons; 1 teaspoon vanilla extract; 2 large eggs; 1/2 cup milk; 1 2/3 cup (8 1/3 ounces) all-purpose flour; 2 1/2 teaspoons baking powder; For Cheese Filling:; 8 ounces cream cheese, softened; 1/3 cup (2 1/3 ounces) granulated sugar; 1 teaspoon juice from 1 lemon; 1 large egg yolk; For Streusel:; 1/2 cup (2 1/2 ounces) plus 1 tablespoon all-purpose flour; 1/4 cup (1 3/4 ounces) packed light brown sugar; 1/8 teaspoon salt; 4 tablespoons (2 ounces) unsalted butter, softened