Preheat oven to 350°F. Mist a skillet with cooking spray. Sauté beef over medium-high heat until no longer pink, 5 to 7 minutes. Add onion; sauté for 3 minutes. Add garlic; cook for 1 minute. Add chili powder and cumin; cook, stirring, for 2 minutes. Add tomato sauce, lower heat and simmer for 10 minutes. Stir in 2 Tbsp. cilantro.
Mist a deep 9-by-13-inch casserole dish with cooking spray. Spread half of meat in baking dish, then half of beans, half of olives, half of corn chips and half of cheese. Repeat layering with remaining meat, beans, olives, chips and cheese.
Bake for 40 to 45 minutes, until golden and crispy on top and bubbling. Sprinkle with remaining cilantro.