Mushroom Dill Scalloped Potatoes

Bahan-bahan (8 porsi)

• 1½ cups sliced mushrooms
• ¾ cup sliced onion
• 1 teaspoon canola or vegetable oil
• ¼ cup all purpose flour
• 2 cups milk
• 1 tablespoon minced fresh dill
• 1 teaspoon Worcestershire sauce
• ¼ teaspoon salt
• ¼ teaspoon pepper
• ½ cup shredded Swiss cheese
• 4 large potatoes, (peeled, washed and sliced into ¼-inch thick rounds)