Spinach and Egg Casserole

Ingredients

• chopped onion
  1 cup
• butter or margarine
  1 tablespoon
• x 10-ounce package frozen chopped spinach

  thawed and drained
  1 unit
• buttermilk
  1 cup
• creamed cottage cheese
  2 cups
• cooked rice
  3 cups
• salt
  1½ teaspoons
• ground black pepper
  ¼ teaspoon
• eggs

  beaten
  4 unit
• fresh tomato

  cut into six slices
  1 large
• shredded mozzarella cheese
  1 cup