Simmer the sauce gently to reduce excess liquid
Whisk in a cornstarch slurry
Whisk in a flour slurry
Add a roux
Stir in grated cheese
Mix in cream cheese
Add a beurre manié
Use egg yolk tempered with a little hot sauce
Blend in mashed potatoes
Stir in pureed vegetables
Add a small amount of instant potato flakes
Whisk in xanthan gum sparingly
Let the sauce cool slightly to thicken naturally