In a large skillet, melt the herb butter over medium-low heat. Add the flour and whisk until smooth. Continue to cook for 2 minutes, whisking constantly.

Add the chicken or turkey stock, poultry seasoning, and garlic and onion powders. Increase heat to medium-high and cook, whisking constantly, until thickened, about 5 minutes. Season to taste with salt and pepper. Serve hot.