Cheesy Hamburger Skillet Or Helper Goulash Cowboy Stuff

Name: Cheesy Hamburger Skillet (Or Helper, Goulash, Cowboy Stuff)
Ingredients: 1 1⁄2 lbs ground beef; 1 medium onion, chopped; 1 (10 ounce) can Rotel Tomatoes (heat level of your choice); 1 (8 ounce) can tomato sauce; 1 (15 ounce) can pinto beans (or chili, Texas, ranch beans); 2 tablespoons chili powder; 5 ounces elbow macaroni (uncooked, about a cup); 1 1⁄2 cups cheese, shredded (cheddar, Mexican or similar); water, as needed for consistency; salt and pepper