Shrimp Scampi Stuffed Shells

Name: Shrimp Scampi Stuffed Shells
Ingredients: Kosher salt; 40 jumbo pasta shells; 1/4 cup olive oil; 4 tablespoons salted butter; 1 teaspoon crushed red pepper flakes; 6 cloves garlic, minced; 1 medium yellow onion, finely diced; 2 pounds peeled and deveined shrimp (21/25 count), chopped; Splash of white wine; 1 lemon, juiced; Freshly ground black pepper; Two 8-ounce packages cream cheese, at room temperature; 2 cups whole-milk ricotta; 1 cup grated Parmesan; 2 tablespoons chopped fresh parsley; 1 large egg; 3 cups grated fresh mozzarella; 8 tablespoons (1 stick) salted butter; 1/4 cup all-purpose flour; 4 cups whole milk; 2 cups heavy cream; 4 cloves garlic, minced; Kosher salt and freshly ground black pepper; 2 tablespoons minced fresh parsley