DirectionsPreheat oven to 350 degrees.
Brown ground beef, garlic, and onion in heavy saucepan, stirring to break up ground beef.
Add spaghetti sauce and stir well to blend.
Let simmer for 10 minutes to blend flavors.
Meanwhile, cook elbow macaroni as directed on package.
While macaroni is cooking, combine cream cheese and milk in medium bowl.
Cook in microwave on medium power for 2-3 minutes, stirring once halfway through cooking.
Remove from microwave and stir with wire whisk until sauce blends.
Drain noodles and add to cream cheese sauce along with sour cream, green pepper, and 1/2 cup Parmesan cheese.
In 2 quart casserole dish, place all of cream cheese mixture.
Top with all of the ground beef mixture and sprinkle with remaining 1/4 cup Parmesan cheese.
Bake at 350 degrees for 20-30 minutes until casserole is bubbly.
To freeze, add 1 tablespoons cornstarch to the cream cheese sauce.
Prepare casserole as directed, except instead of baking, chill in refrigerator.
Wrap well and freeze up to 3 months.
To thaw and reheat, thaw casserole overnight in refrigerator.
Bake, covered, for 25-30 minutes until hot.
Uncover, sprinkle with more Parmesan cheese, and bake 5-10 minutes longer until bubbly.