about 1 minute at HIGH). Add grated onion and flour, then mix well. Gradually add warm or room temperature chicken broth (NOT hot) and half-and-half to container, stirring constantly. Cook uncovered for 5-6 minutes at HIGH, or until sauce is thickened. Do NOT boil. After 2 minutes, stir mixture, then stir again every 30 seconds to one minute. 2. Remove from oven; add seasonings; stir.