Brown the ground beef in a large skillet over medium heat.

Add the chopped onion to the skillet with the ground beef.

Cook until the onion is tender and translucent.

Stir in the tomato paste, water, salt, and pepper.

Reduce heat and simmer for 5 minutes, stirring occasionally.

In a separate saucepan, heat the milk and cubed cream cheese over low heat, stirring constantly.

Continue heating and stirring until the cream cheese is fully melted and the mixture is smooth and well blended.

Stir 1/4 cup of Parmesan cheese, garlic powder, and chopped green pepper into the milk mixture.

Cook the egg noodles according to package directions; drain.

Combine the ground beef mixture and cream cheese mixture.

Add the cooked egg noodles to the sauce and meat mixture, stirring to coat evenly.

Serve immediately, or transfer to a casserole dish to bake.