In a large skillet over medium heat, add the olive oil and swirl to coat pan. Cook the onion and pepper about 5 minutes. Add the mushrooms and cook 2 to 3 minutes longer. Add the cooked turkey, fajita spices, and water. Stir to coat the. Reduce heat and let the liquid thicken and turkey become heated through.
Meanwhile, arrange burrito shells with desired toppings, rice, lettuce, tomatoes, beans, and such.
Scoop the turkey and veggie filling into burritos and fold bottoms up and sides into to create delicious pockets of flavor.