Preheat oven to 180°C (350°F).
In a large pan, heat olive oil over medium heat. Add garlic and sauté until fragrant, about 1 minute.
Add shrimp and scallops to the pan, season with salt and black pepper, and cook until just opaque, about 2-3 minutes. Remove from heat.
Spread a thin layer of bechamel sauce over the bottom of a 9x13 inch baking dish.
Layer uncooked lasagna noodles over the sauce, followed by half of the seafood mixture, half of the ricotta cheese, and a third of the mozzarella and parmesan cheeses.
Repeat with another layer of noodles, remaining seafood mixture, ricotta, and another third of the mozzarella and parmesan.
Top with a final layer of noodles and spread remaining bechamel sauce over the top. Sprinkle the remaining mozzarella and parmesan cheeses.
Cover with aluminum foil and bake for 30 minutes. Remove foil and bake for another 10 minutes until cheese is golden and bubbly.
Garnish with chopped parsley before serving.