elizabeth's spinach quiche from smitten kitchen

with or without crust even:
1 3-ounce package cream cheese, room temperature
1/3 cup half and half (or milk)
3 eggs
1 10-ounce package frozen chopped spinach, thawed and drained
1/2 cup grated cheddar (gruyere works well, too)
1/4 cup grated Parmesan
4 to 6 green onions, thinly sliced (1/2 cup finely diced red or white onion or shallots work as well)
1/4 teaspoon salt
1/4 teaspoon pepper

Preheat oven to 425°. Beat cream cheese in medium bowl until smooth. Gradually beat in half and half and eggs. Mix in remaining ingredients. Pour mixture into prepared crust. Bake until crust is golden brown and filling is set, about 25 minutes. Cool 10 minutes before serving.