Add shrimp and cook for 2-3 minutes until they turn pink. Remove from heat and let cool slightly.
Combine cooked shrimp, crab meat, Alfredo sauce, ricotta cheese, heavy cream, salt, black pepper, chili flakes (if using), and chopped parsley in a mixing bowl.
Spread a thin layer of the seafood mixture in a 9×13 inch baking dish.
Layer 4 lasagna noodles over the seafood mixture. Top with another layer of the seafood filling and sprinkle with mozzarella and parmesan cheese.
Repeat the layers until all ingredients are used, finishing with a layer of mozzarella and breadcrumbs on top.
Cover with foil and bake for 25 minutes, then remove the foil and bake for an additional 15 minutes, or until cheese is golden and bubbly.
Let it rest for a few minutes before serving.
Notes
Consider using fresh ingredients for the best flavor. This lasagna pairs well with a fresh green salad or garlic bread.