maple cream cheese spice muffins

Name: maple cream cheese spice muffins
Ingredients: For the muffins; 1 1/2 cups all purpose flour; 2/3 cup sugar; 3/4 teaspoon baking powder; 3/4 teaspoon baking soda; 1/4 teaspoon salt; 1/2 teaspoon allspice; 1 teaspoon cinnamon; 1 teaspoon nutmeg; 1 tablespoon lemon juice; 2 tablespoons lemon zest; 1 teaspoon vanilla extract; 1 egg, lightly beaten; 5 tablespoons melted butter; 1 cup sour cream; Cream Cheese Filling and Streusel topping; 12 tablespoons room temperature Cream Cheese (not whipped); 1/2 cup maple syrup; 1/2 cup walnuts or almonds (if allergic to nuts,use oatmeal); 1 cup all purpose flour; 4 tablespoons brown sugar; 1 tablespoon granulated sugar; 6 tablespoons butter, cut into small pieces; pinch of salt