1. In a large bowl, sprinkle lime juice over shrimp to coat well.
2. In a separate small bowl, blend the garlic powder, onion salt, thyme, salt, red pepper and black pepper
3. Sprinkle mixed spices over the shrimp to coat well.
4. In a large skillet, heat vegetable oil and add shrimp, stirringly constantly until shrimp turn pink.
5. Transfer to serving platter.
6. When just lukewarm, cover and chill in refrigerator. Serve cold.