Preheat oven to 350 F. Melt butter in 9 X 13 baking dish in oven and remove. In another dish, beat eggs well. Add flour, milk, and baking powder. Mix well. Add cheese, spinach, and onion. Mix well. Spoon into baking dish. Sprinkle on seasoned salt.
Bake at 350 F for 35 minutes. Cool about 45 minutes before cutting. Best served warm.
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