Preheat your oven to 400°F (200°C). Gather all your ingredients and equipment.

Chop the peeled and deveined shrimp into small, chunky pieces.

In a mixing bowl, combine the chopped shrimp with mayonnaise, melted butter, minced garlic, sliced scallions, and black pepper. Stir well.

Slice the ciabatta or baguette in half horizontally and lay the slices on a baking sheet, cut side up.

Spread the shrimp mixture evenly across the cut sides of the bread.

Bake for 15-18 minutes until golden brown and crispy around the edges.

Remove from the oven and sprinkle with fresh basil. Serve immediately.