How do you thicken biscuits and gravy?

Online Answer
Flour will often thicken gravy enough for many, but if you're having trouble getting the gravy as thick as you'd like, make a cornstarch slurry. This is a simple mixture of cornstarch and water, whisked together and then drizzled into the hot gravy.
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To make a cornstarch gravy, start by making a slurry (blend) of cornstarch and a small amount of cold liquid (generally water or broth). You will need about 1 tablespoon of cornstarch to thicken about 1 1/2 to 2 cups of gravy. Don't add powdered cornstarch directly to a hot liquid.
The name "red eye gravy" comes from the appearance of the gravy once it has been placed in a serving bowl. While the dark coffee and meat bits sink to the bottom, a layer of grease is usually visible on top – the result, giving the appearance of a human eye.