Toss the shrimp, with the lime juice, in a bowl. Mix the garlic powder, onion powder, thyme, salt and peppers in a small bowl. Sprinkle mixture over shrimp and toss to coat well. Spray a large skillet with non-stick cooking spray and heat skillet until hot. Add shrimp and cook for 3 minutes, or until shrimp are pale, stirring constantly. Spoon into serving dish. Chill, covered, for hour or longer. Garnish with lime wedges.