Chicken, Rice and Mushroom Sauté

  1 tbsp        olive oil
  ¼ cup         chopped green onions
  One           medium clove garlic, finely minced
  6 oz.         sliced mushrooms
  Three         boneless chicken breasts
  1 can         condensed cream of mushroom soup
  1½ cups       milk
  ¼ tsp         black pepper
  1 cup         rice