Cheeseburger Noodle Casserole

1 pkg (12 oz) Medium Egg Noodles
1 lb ground beef
1 can (14.5 oz) diced tomatoes with onions, not drained
2 1/2 cups water
1 Tbsp prepared yellow mustard or Dijon mustard
Salt and pepper, to taste
8 oz pasteurized cheese product, cut into 1/2-inch cubes

Cook ground been in a large, nonstick skillet over medium-high heat, stirring frequently, until meat is browned. Drain. Return meat to the skillet over medium-high heat.
Add tomatoes, water, mustard and salt and pepper to beef. Heat until mixture is simmering. Reduce heat to maintain a simmer and stir in uncooked noodles.
Cook, stirring frequently, 7 to 9 minutes or until noodles are done.
Stir in cheese cubes and cook, stirring frequently, until cheese is melted.
If desired, add one can (11 oz) corn, drained, along with the tomatoes.