1 stick butter
1/2 onion, chopped
2 pkg. frozen chopped spinach
14 oz. can artichoke hearts
1/2 to 1 c. Parmesan cheese
1 pt. sour cream

Saute onion in butter. Cook spinach according to directions on package. Drain well. Drain artichoke hearts and cut in quarters. Mix all with sour cream using 1/4 cup Parmesan and sprinkle 1/4 cup Parmesan on top. Pour in square casserole. Bake at 350 degrees for 30 minutes.