While the crust is baking, beat the eggs in a large bowl, then add in the heavy cream, ham, cheese, parsley, green onions, salt, and pepper to the whisk until evenly combined.
5 large eggs, ½ cup heavy cream, 1 cup chopped ham, 1 cup shredded cheddar cheese, ¼ cup green onions, 2 teaspoons fresh parsley, ½ teaspoon salt, ½ teaspoon ground black pepper