Step 1

Pour fat from drippings into a bowl and reserve. Whisk flour into remaining drippings left in pan; mixture will seem dry. Add 2 tablespoons reserved fat, or as needed, to the drippings mixture to combine with flour.

Step 2

Place pan of drippings mixture over low heat and toast flour until light brown and mixture gives off a nutty fragrance, about 5 minutes.

Step 3

Drizzle about 1/3 cup cold chicken stock at a time into pan drippings, whisking each addition of stock into mixture until thoroughly combined. Continue whisking, scraping any browned pan drippings from the bottom of the pan into gravy; bring to a simmer. Continue to cook, whisking constantly, until gravy is thick and flour has combined with the liquid, 8 to 10 minutes.

Step 4

Adjust thickness of gravy; if too thick, whisk in a little more stock. If gravy is too thin, continue to simmer, whisking constantly, until reduced and thickened, about 10 more minutes. For the smoothest texture, strain gravy before serving.