Heat a 10" cast-iron fry pan with 1 tsp. of canola oil. Brown the chicken. Add the garlic and cook for 1 min. Add the 3 tsp. of taco seasoning or to taste. Stir to coat and then add 1/2 cup water. Stir and cook until water is evaporated. Remove chicken from the pan into a bowl and add the taco sauce and season with salt and pepper. Set aside. Preheat oven to 450F.

In the same pan, over medium heat, add the remaining 3 tsp. oil. Add the little potatoes and season with salt and pepper. Place the onions on top, don't stir in initially. Season with salt and pepper. Cook covered for 15-20 min. stirring often until potatoes are tender and onion are cooked. Remove the lid and top with the chicken and then the cheese. Place into the oven and bake for 20-25 min. until the cheese is melted and it is all heated through.

Top with sliced tomatoes and cilantro and serve.