To thaw shrimp, place in a colander or strainer and rinse with cool water until it is thawed. Drain well.
Chopped garlic in the jar is a convenient alternative to fresh garlic. It's easy to use and keeps in the refrigerator for up to six months.
Prepare the casserole without the topping. Cover tightly and refrigerate until ready to bake. Uncover casserole and sprinkle with topping. Bake as directed in recipe.
Serve this elegant casserole with a Caesar salad and Italian rolls with butter and preserves.