Saute garlic in olive oil in medium saucepan over medium heat. (FODMAPs peeps remove garlic pieces)Reduce heat, and carefully add water and polenta to pan.Stir while cooking on low-medium heat.Add in thyme stems and place cover on pan. Stir occasionally, cooking for about 20 minutes or until creamy consistency.Add butter and Parmesan cheese and gently stir to incorporate.Remove thyme stems.Season with salt and pepper.