Pound the chicken breasts to ½-inch thickness using a meat mallet or rolling pin. Season both sides with cumin, garlic powder, chili powder, salt, and pepper, ensuring even coverage for balanced flavor throughout the meat.
Heat olive oil in a large skillet over medium-high heat. Once the oil shimmers, add seasoned chicken and cook for 6–7 minutes per side until the internal temperature reaches 165°F and the exterior is golden brown.
Transfer cooked chicken to a cutting board and let rest for 3 minutes before slicing into bite-sized pieces. This resting period allows juices to redistribute, keeping every piece of chicken tender and moist.
Preheat your oven to 375°F. Arrange tortilla chips in a single layer on a large baking sheet, then distribute the sliced chicken evenly across the chips for consistent distribution.
Sprinkle cheddar and mozzarella cheese generously over the chicken and chips. Bake for 8–10 minutes until cheese is completely melted and slightly bubbly, creating that signature gooey loaded chicken nachos texture everyone loves.
Remove from the oven and immediately top with sour cream drizzles, salsa, jalapeños, diced tomatoes, red onion, and fresh cilantro. Squeeze fresh lime juice over everything right before serving.