Step 1

When ready to bake, preheat oven to 350°F.

Step 2

Arrange potatoes in the bottom of an 9x13-inch baking dish. Sprinkle with cheese, ham, and green onion.

Step 3

In a large mixing bowl, combine eggs, evaporated milk, garlic salt, and pepper. Pour evenly over ingredients in baking dish.

Step 4

Cover and refrigerate up to overnight, if desired. If chilled, bake uncovered until center is set, about 1 hour 30 minutes. If baking unchilled, reduce time to 1 hour 15 minutes.