Pour turkey drippings into a saucepan and bring to a gentle simmer over medium heat.
In a small bowl, whisk flour with a bit of the warm drippings to make a smooth paste.
Slowly whisk the paste back into the saucepan, stirring constantly to prevent lumps.
Continue whisking over medium heat until the gravy thickens, about 5–7 minutes.
Season with salt, pepper, and optional herbs to taste. Serve warm.