Begin by sautéing your shrimp lightly in a warm pan. Cook just until they start to turn pink — you’ll finish them in the oven. Add crab meat at the end to warm through without falling apart.
In the same pan, toss in fresh spinach and a little garlic. Cook until wilted and fragrant, then squeeze out excess water using a colander or clean kitchen towel to avoid a watery dip.
In a mixing bowl, combine softened cream cheese, sour cream, and mayonnaise until smooth. Stir in the Parmesan and mozzarella, then add salt, pepper, and any optional spices like lemon zest or Old Bay for that seafood zing.
Gently fold in your cooked shrimp, crab, and drained spinach mixture. Make sure everything is evenly coated in the creamy base.
Spoon the dip into your greased baking dish and spread it evenly. Bake at 375°F (190°C) until hot, bubbling, and lightly golden on top — about 25 minutes. Let it rest a few minutes before serving.