Preheat the Oven:
Preheat your oven to 375°F (190°C).

Prepare the Shrimp:
Pat the shrimp dry with paper towels and season lightly with salt and black pepper.

Sear the Shrimp:
Heat olive oil in a skillet over medium heat. Add shrimp in a single layer and cook for 1–2 minutes per side, just until pink and opaque. Remove from the skillet and set aside.

Cook the Aromatics:
In the same skillet, melt the butter over medium heat. Add minced garlic and diced onion and cook for 3–4 minutes until soft and fragrant.

Add the Spinach:
Stir in the well-drained spinach and cook for 2 minutes to remove any remaining moisture.

Create the Creamy Base:
Lower the heat and add the cream cheese. Stir until it begins to melt. Pour in the heavy cream and mix well.

Add the Cheese and Seasonings:
Stir in Parmesan cheese, mozzarella cheese, paprika, crushed red pepper flakes (if using), garlic powder, and onion powder. Continue stirring until smooth and creamy.

Add the Crab Meat:
Gently fold in the lump crab meat, keeping the pieces intact.

Assemble the Dish:
Lightly grease a baking dish. Spread the creamy spinach mixture evenly across the bottom.

Add the Shrimp:
Arrange the seared shrimp on top, slightly nestling them into the spinach mixture.

Add the Crunchy Topping:
Sprinkle panko breadcrumbs evenly over the top.

Bake:
Bake for 20–25 minutes, until the mixture is hot and bubbling.

Broil for Crispness:
For a golden crust, switch the oven to broil for 2–3 minutes until the breadcrumbs are lightly toasted.

Garnish and Serve:
Remove from the oven and sprinkle with fresh chopped parsley. Serve warm.