Slice the corn tortillas into small triangles and dice the chicken breast into bite-sized pieces.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Add the tortilla triangles to the skillet, frying until they are golden and crispy, then remove and drain on a paper towel.
In the same skillet, sauté the diced chicken, red onion, and minced garlic until the chicken is cooked through and the onions are translucent.
Season the mixture with sea salt, black pepper, and chili powder, stirring to coat the chicken evenly.
Pour in the tomato puree and lime juice, allowing the sauce to simmer and thicken for about 3-5 minutes.
Gently fold the crispy tortillas back into the skillet, coating them in the warm sauce without letting them get too soggy.
Serve immediately topped with fresh cilantro for a vibrant finish.