You can totally make a cream sauce without heavy cream! One of the easiest ways to substitute heavy cream in alfredo sauce is to use a thickener + milk. We chose corn starch + milk because it gives that same creamy texture without the fattiness that heavy cream brings. The corn starch also allows you to thicken your pasta sauce without heavy cream. You can use any type of milk instead of heavy cream to pair with the corn starch. Whole milk, skim milk, low-fat milk, and different types of unsweetened dairy-free milk will all work. Other heavy cream substitutes include: silken tofu and soy milk, cottage cheese and milk, or flour and milk.