In a medium size bowl mix soup with 1/2 can of water. Stir until smooth. Add hamburger meat,thawed frozen mixed vegetables,and green chilies to soup mixture, stir until blended well.
layer a 9x9 pan with tater tots covering the bottom of the pan. Place soup mixture on top of tater tots, smooth soup mixture covering all the tater tots. Layer the top of soup mixture with cheese then place another layer of tater tots on top of the cheese. Place in oven and cook for 1 hour or until heated all the way through.