Cheesy Beef Corn-Chip Skillet

1 lb. ground beef

1 small  onion, chopped

3/4 cup water

1 pkg.  (1-1/4 oz.) TACO BELL® HOME ORIGINALS® Taco Seasoning Mix

2 cups corn chips

1/4 lb.  (4 oz.) VELVEETA Pasteurized Prepared Cheese Product, cut into 1/2-inch cubes

2 cups shredded lettuce

2   tomatoes, chopped 

 

BROWN meat with onions in large skillet; drain. Add water and seasoning mix; cook as directed on package.
COVER meat mixture with chips and VELVEETA; cover. Cook on low heat 5 min. or until VELVEETA is melted.
TOP with lettuce and tomatoes.