Preheat oven to 350º F.

Brown beef over the stovetop. Drain.

Add salsa and beans, bring to a boil and remove from heat.

Add tortilla chips to bottom of 13 x 9 inch baking dish.

Pour meat mixture on top of chips.

Spread sour cream over meat mixture, and top with cheese, tomatoes, and onions.

Bake for 25-30 minutes.