Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
Heat a skillet over medium heat and add a tablespoon of oil or butter. Add the minced garlic and sauté for 30 seconds until fragrant—don’t let it brown.
Add the chopped shrimp to the skillet. Cook, stirring occasionally, for 2–3 minutes until the shrimp turn pink and are opaque inside. If using pre-cooked shrimp, warm just until heated through.
Add the crab meat to the skillet and gently fold it with the shrimp for 1 minute to warm through. Remove the skillet from heat.
Stir in the sour cream, 3/4 cup of the shredded cheese (reserve some for topping if you like), sliced green onions, cayenne pepper, and a pinch of salt and pepper. Taste and adjust seasoning as needed.
Open the package of refrigerated biscuits. Lightly flatten each biscuit with your palm or a rolling pin to form a disc roughly 1/4 inch thick.
Place a generous spoonful (about 2 tablespoons) of the seafood mixture in the center of each flattened biscuit. Fold the biscuit over or pinch the edges to seal the filling inside—create a little parcel or crimp like a dumpling.
Arrange the filled biscuits seam-side down on the prepared baking sheet. If desired, brush the tops with a little melted butter and sprinkle with the remaining shredded cheese.
Bake in the preheated oven for 15–20 minutes, or until the biscuits are puffed and golden brown and the cheese is melted. Let cool for a couple of minutes before serving hot.
Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. You can freeze unbaked filled biscuits on a baking sheet until firm, then transfer to a freezer bag for up to 2 months.