Hi Holly! Great catch. The cornstarch is simply to thicken the sauce (if you prefer a creamier sauce). We added this step: “Whisk in the cornstarch (you can mix it with a little milk or water first to avoid clumps). Continue stirring as the sauce heats. This will help thicken the Alfredo sauce to a creamy consistency.” You do add it to the milk and bean mixture. Sometimes you can add cornstarch in directly to thicken a sauce but it really helps to make a slurry so that it’s not too clumpy. So you can add a bit of milk or water with the cornstarch to make a “slurry”. Hope this helps! We’re glad you enjoyed this recipe.

Thank you, Mavis!