1. Heat the oven to 425 F. Line a baking sheet with foil or parchment paper. 
2. In a small bowl, combine the chili powder, cumin, garlic powder, oregano, paprika, salt and pepper. 
3. In a medium bowl, add the sliced peppers and onion, 2 tablespoons olive oil and half of the seasoning mixture, about 3 teaspoons. Mix well and spread out on the prepared baking sheet. 
4. Bake for 10 minutes. Meanwhile, combine the rest of the spice mixture with the shrimp and remaining 1 tablespoon of olive oil.
5. After 10 minutes, add the shrimp to the baking pan and bake for another 10 to 12 minutes, until the shrimp and veggies are cooked through. 
6. Serve on tortillas with cilantro, sour cream and cheese.

2 teaspoons chili powder
2 teaspoons cumin
1 teaspoon garlic powder
1 teaspoon dried oregano
½ teaspoon paprika
½ teaspoon salt
½ teaspoon pepper
1 red bell pepper, stem and seeds removed, sliced
1 yellow bell pepper, stem and seeds removed, sliced
1 red onion, sliced
3 tablespoons olive oil, divided
1 pound raw shrimp, peeled and deveined
Chopped fresh cilantro, sour cream and shredded cheese, for topping
8 fajita tortillas