Crush 1 1/2 cups corn chips; place 3/4 in bottom of 8-inch square pan. Fry 1 pound hamburger meat until brown; drain off fat. Add 1 envelope taco seasoning and pour evenly over corn chips.

Mix 2 cups cooked pinto beans with 1 small can tomato sauce (or 1 cup). Pour over meat mixture. Bake 35 minutes, covered, at 400 degrees.

Remove from oven; sprinkle 1 cup grated Colby cheese over top, then remaining chips. Return to oven and bake 5 minutes more, uncovered, or until cheese melts.