Prep: Let the cheddar cheese spread and cream cheese sit out until they reach room temperature to make mixing easier.
Combine: In a bowl, mix together the 8 oz of sharp cheddar cheese spread and the 8 oz of cream cheese.
Add Seasonings: Add the packet of Italian salad dressing mix, 1 tablespoon of sour cream, and 1/4 cup of Parmesan cheese.
Mix: Blend all ingredients together thoroughly.
Serve: You can serve it immediately in a bowl as a spread with crackers.