In a medium saucepan to a medium-high heat, add olive oil, garlic and rosemary. Saute until golden in color. Add warm chicken stock, cream, Dijon mustard, wholegrain mustard and stir until well combind. Lower the heat to medium-low and continue stirring until the sauce starts to thicken. Season with salt and pepper and set aside. Note: feel free to add a dash of cream or chicken stock is the sauce is a tad too thick for your liking.