Cheesy Beef Corn Chip Skillet

1 lb. ground beef
1 small onion, chopped
1 pkg. (1-1/4 oz.) TACO BELL® HOME ORIGINALS® Taco Seasoning Mix
2 cups corn chips
1/2 lb. (8 oz.) VELVEETA Pasteurized Prepared Cheese Product, cut up
1 cup chopped tomatoes

BROWN meat with onion in skillet on medium-high heat; drain.
ADD seasoning mix; prepare as directed on package.
TOP with corn chips and prepared cheese product; cover. Cook on low heat 5 minutes or until prepared cheese product is melted. Sprinkle with tomatoes. Serve immediately.

Source: Kraftfoods.com