Make the Creamy Avocado Sauce: Combine half of a ripe avocado, 1/4 cup sour cream, one tablespoon of fresh lime juice, 1/4 packed cup of cilantro leaves, 1/2 teaspoon of kosher salt, and two tablespoons of water in a mini food processor. Blend until smooth, adding more water if needed to achieve the consistency you want. Taste and season with more salt or lime juice if desired, then cover the sauce and refrigerate until ready to use.
Cook the Turkey and Onions: Heat two teaspoons of avocado oil in a large non-stick pan over medium heat. Add 8 ounces of lean ground turkey, half of the seasoning blend from the ingredient list (or 2 1/2 tsp. of taco seasoning), and 1/3 cup of chopped onion. Cook the turkey, breaking it into small pieces and mixing it into the seasoning and onions as it cooks, for 4-5 minutes until browned and cooked through.
Finish the Taco Filling: Stir half a can (3/4 cup) of black beans, four ounces of green chiles, the remaining taco seasoning blend, two tablespoons of water, and two tablespoons of finely chopped cilantro into the turkey mixture. Stir to thoroughly combine, then turn the heat beneath the pan to medium-low and allow the turkey taco mixture to simmer for fifteen minutes uncovered.
Stir everything together again: If there seems to be excess liquid, turn the heat underneath the pan to medium and cook for a few minutes stirring frequently until most of the liquid has evaporated. Remove the pan from heat.
Build the Tacos: Preheat oven to 425 F. Spray a large rimmed baking sheet with cooking spray or brush avocado oil over it. Lay six fajita-sized flour tortillas onto the baking sheet just barely overlapping if necessary. Spread about 1/4 cup of shredded cheese across each tortilla’s surface.
Spoon about 1/4 – 1/3 cup of turkey black bean mixture onto one half of each tortilla before proceeding to bake them.