Spinach Spaghetti

This is one of dh's favorites, I got it from his mom (and made a few changes, like whole wheat pasta)

1 lb whole wheat spaghetti, cooked & drained
2 10 oz packages frozen spinach, thawed & drained
2 eggs, beaten
1 cup sour cream
1/2 c milk
1/4 c Parmesan cheese
1/4 c chopped onion
1 tsp salt
4 c shredded jack cheese
1/4 c Parmesan cheese

Combine all but 1/4 c Parmesan. Put in 9x13 casserole. Sprinkle 1/4 c Parmesan on top. Bake 45 minutes, covered. at 350.

This freezes wonderfully and is so easy & yummy!!!