Preheat the oven to 375°F (190°C) and spray a 12-cup muffin pan with cooking spray.
In a mixing bowl, stir together the cottage cheese, egg, and dried parsley until combined; set aside.
In a 12-inch skillet over medium heat, cook the Italian sausage, breaking it into crumbles, until no longer pink; drain excess fat.
Add the jar of spaghetti sauce to the cooked sausage, stir to combine, and simmer for about 5 minutes; then remove from heat.
Place one wonton wrapper into the bottom of each prepared muffin cup.
Spoon about 1 tablespoon of the meat sauce into each cup over the first wonton, then top with a second wonton wrapper.
Layer a spoonful of the cottage cheese mixture, about 1 tablespoon shredded mozzarella, about 1 tablespoon meat sauce, and roughly 1 teaspoon grated Parmesan on top of the second wonton.
Place another wonton wrapper on top and repeat: a spoonful of cottage cheese mixture, 1 tablespoon mozzarella, 1 tablespoon meat sauce, and 1 teaspoon Parmesan.
Top each cupcake with the remaining shredded mozzarella (distribute evenly across cups).
Bake the cupcakes in the preheated oven for 20–25 minutes, until the cheese is melted and the tops are lightly golden.
Let the cupcakes rest in the pan for 5 minutes, run a knife around the edges to loosen, then remove from the pan and serve with any leftover meat sauce.