Shrimp. Large (or medium sized) shrimp should be deveined. Jumbo shrimp should be deveined and butterflied so that it can be stuffed. Lastly, use pre-cooked shrimp or cook it yourself.
Prep. Preheat your oven to 425. Also, prep a large casserole dish for nonstick.
Toss. In a large bowl, toss together your shrimp with the olive oil and seasonings.
Base Layer. Arrange the tossed shrimp on the bottom of your casserole dish. If you have butterflied your shrimp, have the openings on top.
Stuffing. To make the stuffing, combine together the crab meat, minced garlic, lemon juice, cracker crumbs, melted butter, and parsley in a mixing bowl.
Layer. Evenly spread the stuffing layer over the shrimp layer. For the butterflied shrimp, you can use a teaspoon to first stuff the shrimp with the stuffing and then use the remaining stuffing as a layer on top.
Bake. Bake your casserole for 12-14 minutes or until the top layer is browned.
Set. Let the casserole sit at room temperature for a couple of minutes before serving.