1. Preheat the grill to medium-high heat.
2. In a mixing bowl, combine shrimp, olive oil, chili powder, cumin, garlic powder, paprika, salt, and black pepper. Toss to coat.
3. Thread shrimp onto skewers.
4. Grill shrimp for 2-3 minutes per side, until opaque and cooked through.
5. In a separate bowl, toss bell peppers and onion with a little olive oil, salt, and pepper.
6. Grill vegetables for 5-7 minutes, until tender and slightly charred.
7. Warm tortillas on the grill for about 30 seconds per side.
8. Serve grilled shrimp and vegetables on warm tortillas. Enjoy!