In 10-inch skillet, heat uncooked pasta and sauce mix (from Hamburger Helper box), uncooked elbow macaroni, milk and hot water to boiling over medium-high heat. Reduce heat; cover and simmer 10 to 12 minutes, stirring occasionally, until pasta is tender. Remove from heat. Stir in mushrooms and chili. Spread mixture in baking dish. Sprinkle with cheese.