Prepare spinach according to package directions; drain well.
Combine milk, butter, onion, parsley flakes, salt, Worcestershire sauce, thyme and nutmeg; mix well.
Add to eggs.
Combine egg mixture with spinach, rice and cheese; blend well.
Pour into a greased shallow 2-quart baking dish.
Bake in 350-degree oven for 40 minutes or until set.
Cut into squares.