using, whisk in the crushed red pepper flakes. This is your one creamy liquid mixture.
Return the Dutch oven to medium heat. Slowly pour the creamy liquid mixture evenly over the uncooked pasta shells and browned beef in the Dutch oven, making sure to cover as much of the pasta as possible. Use the back of a spoon to gently press any exposed shells down into the liquid so they can cook evenly, but avoid heavy stirring.
Bring the mixture just up to a gentle simmer, then reduce the heat
