Pour desired amount of drippings or broth into the bottom of a saucepan. If using drippings, let fat solidify on the top, skim off the top and discard.
Bring your pan to a boil, then whisk in slurry (quickly stir before adding as it settles fast) and cook on medium-high heat for 1-2 minutes or until gravy has thickened.
Refrigerate leftover gravy in an airtight glass container for up to 5 days. Reheat: simmer the mixture on low heat in pan stirring frequently. You may need to add water/broth.