Saute onions and mushrooms in frying pan with PET orange juice and ˝ cup butter. Gradually increase temperature as onions and mushrooms cook until heat is very high. All moisture should cook into onions and mushrooms. At same time, sauté chicken in ˝ cup butter in separate pan. When chicken is cooked completely, add onion/mushroom mixture and pour PET heavy cream over the top. Stir and heat thoroughly. Great served over rice.