Preheat the broiler.
In a nonstick skillet over medium-high heat, sauté the chicken until cooked through, about 5 minutes. Season with the chili powder and salt.
Lay the pita chips on a large baking sheet. Evenly top with chicken, mango, bell pepper, and cheese. Place under the broiler until the cheese is melted, about 3 to 5 minutes.
Remove from the oven and top with avocado, cilantro, lime, and a pinch of salt. Serve.