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Brown ground beef and onion, drain.
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Add spaghetti sauce and let simmer 10 minutes.
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Cook elbow macaroni according to package.
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Mix cream cheese and milk in medium bowl and microwave on medium for 2-3 minutes. After microwaving, stir with wire whisk until blended.
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Drain noodles and add to cream cheese mixture. Stir in sour cream, green pepper and parmesan cheese.
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Mix together meat and cream cheese mixture in 2 qt casserole dish or freezer bag and freeze up to 3 months.
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To serve, thaw overnight in refrigerator. Bake, covered at 350 degrees for 25-30 minutes until hot. Uncover, sprinkle with Parmesan cheese and bake 5-10 more minutes.