Preheat oven to 375. If you are making shrimp, preheat to 450.
Wash chicken or shrimp, pat dry and place in a large bowl.
To make marinade, combine olive oil, taco seasoning, chili powder, garlic powder, salt, pepper and juice of the lime. Whisk well.
Slice vegetables into thin slices and add to meat.
Pour marinade over meat and vegetables and coat well.
Spread mixture onto sheet pan and bake for 25 minutes or until meat is cooked through if you are making chicken. Bake for 15 minutes if you are making shrimp.
Serve with warm tortillas, salsa, shredded cheese, lettuce, tomato, and sour cream.