Crowd Pleaser Football Fiesta Casserole

2 lbs. lean ground beef1 large Vidalia onion, chopped3 T. minced garlic¼ c. chili powder1 T. ground cumin3 (15-oz.) cans tomato sauce¼ c. fresh cilantro, chopped3 (16-oz.) can red kidney beans, drained and rinsed1 (6-oz.) can black olives, drained and…