Step 1

Heat oven to 350°F. In 10-inch skillet, cook beef over medium-high heat 5 to 7 minutes, stirring occasionally, until thoroughly cooked; drain. Stir in beans, tomato sauce and taco seasoning mix. Reduce heat to medium; heat to boiling, stirring occasionally.

Step 2

In ungreased 1 1/2- to 2-quart casserole, place tortilla chips. Top evenly with beef mixture. Sprinkle with onions, tomato and cheese.

Step 3

Bake uncovered 20 to 30 minutes or until hot and bubbly. Arrange additional tortilla chips around edge of casserole.