Dice chicken tenderloins in large chunks. Rinse and pat dry.
In a large bowl, add chicken, olive oil, ground cumin and Sunshine seasoning and mix.
On medium heat, add chicken mixture to a large skillet. Cover skillet and cook for 10 minutes.
Stir in Rotel tomatoes and cover. Cook for 40 minutes or until extra liquid is almost evaporated.
Stir in Margie's Mango Herb and Garlic Marinade and Basting Sauce. and cover again. Cover and cook for 10 minutes.
Heat tortillas and add your favorite taco toppings.