Heat a large skillet over medium-high heat
Cook and stir beef in the hot skillet until browned and crumbly, 5 to 7 minutes
Stir pasta and cheese mixture from macaroni and cheese package into beef
Stir in tomatoes, milk, peas, and corn; bring to a boil
Reduce heat to medium-low, cover, and simmer until noodles are tender, about 12 minutes
Season with seasoned salt
Stir ½ of the Cheddar cheese into dish to melt
Top with remaining cheese
