Cheese Blintzes

Name: Cheese Blintzes
Ingredients: 1 cup flour; 3 1⁄2 tbsp. sugar; 1⁄2 tsp. kosher salt; 1 1⁄4 cups milk; 3 tbsp. canola oil; 1 3⁄4 tsp. vanilla extract; 4 eggs, plus 1 yolk; 1 lb. farmers’ cheese, at room temperature; 6 oz. small curd cottage cheese; 3 tbsp. cream cheese, softened; 1⁄2 tsp. grated lemon zest; Applesauce, for serving (optional)