Preheat your oven to 350°F (175°C).

In a mixing bowl, combine mayonnaise, grated Parmesan cheese, finely chopped white onion, lump crab meat, artichokes, and chopped flat parsley. Sprinkle in fine sea salt, white pepper, and smoked paprika. Fold gently to maintain the crab’s texture.

Slice your thick-cut bread into hearty pieces. Lightly toast the bread until golden brown.

Spoon the crab mixture onto each slice of toasted bread, spreading it evenly.

Layer sliced tomatoes on top of the crab mixture followed by a generous layer of cheese.

Place the sandwiches on a baking sheet coated with cooking spray and bake for 15 to 20 minutes until the cheese is bubbly and golden brown.

Carefully remove the sandwiches from the oven and allow them to cool for a brief moment before serving.