Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine shrimp, crab meat, cheddar cheese, cream cheese, mayonnaise, Dijon mustard, Old Bay seasoning, garlic powder, and black pepper until well combined.

Open the refrigerated biscuit dough and separate each biscuit.

On a lightly floured surface, roll each biscuit to about 1/4 inch thick.

Spoon about 2 tablespoons of the seafood filling into the center of each biscuit.

Fold each biscuit over the filling to create a half-moon shape and pinch the edges to seal.

Line a baking sheet with parchment paper and place the sealed biscuits on it with space in between.

Brush the tops of each biscuit lightly with melted butter.

Bake for 15-20 minutes until golden brown and puffed up.

Cool slightly and garnish with chopped fresh parsley before serving.