Preheat your oven to 400 degrees Fahrenheit. Line a large, rimmed sheet pan with foil and spray with non-stick cooking spray.
In a small bowl combine the chili powder, garlic powder, cumin, oregano, paprika salt, pepper, and chipotle chili powder, then add the avocado oil and stir to combine.
Add the shrimp, sliced bell peppers, and sliced onion to a large bowl, then pour over the seasoned oil blend and stir to combine. Pour the fajita mixture onto the prepared sheet pan and spread in a single layer. You can also just mix everything on the sheet pan if you would prefer.
Bake the shrimp fajita mixture for 10 minutes, or until the shrimp are pink and opaque. Then turn the broiler on for about 2 - 3 minutes to add a little char, watch so it does not burn.
Once the shrimp and peppers have finished baking, squeeze fresh lime juice over the shrimp and sprinkle with chopped cilantro.
Serve with warm tortillas and the toppings of your choice. Enjoy!