Pour turkey drippings from roaster into a large Dutch oven or stock pot.
Skim the oil off the top of the drippings from turkey.
It may be a half cup to a cup of oil you have to skim off the top of the broth.
Discard.
Bring drippings to a boil over medium to medium-high heat.
Stir in a cup or two of giblet turkey broth or reserved potato water.
Add salt, pepper, several drops of Kitchen Bouquet seasoning, and garlic powder and parsley, if desired.
Start with a cup of flour.
Whisk in small amounts of water until you get a thin smooth paste.
Make sure you whisk out ALL of the lumps from the flour.
After turkey drippings come to a rolling boil, slowly stir in flour/water paste mixture.
Don’t add it too fast or you will end up with lumpy gravy.
Add all the paste mixture and boil a few minutes.
If the broth remains thin, repeat the process again making another flour/water paste mixture and adding slowly to drippings.
Continue whisking the flour mixture into the turkey broth and whisk while gravy thickens.
Check seasoning. Add more salt and pepper if needed.
Serve gravy over turkey, dressing, and mashed potatoes, as desired.