I use Emeril Lagasse's Essence spice mixture. Use less seasoning for less spicy shrimp. For more spice, add cayenne pepper to taste. For no spice at all, use a seasoning mix without cayenne.
Do not overcook the shrimp. They turn hard and rubbery if overcooked.
Serve over rice or Asiago cheese grits. These shrimp are great over a green salad, too, even chilled.