Heat oven to 350.

Defrost and drain spinach by squeezing handfuls.

Place butter in 9x13 baking dish and place in oven till melted. Do not allow to brown.

Place eggs and milk in large bowl and mix thoroughly. Add flour, baking powder, salt and pepper and stir gently until completely mixed. Add cheese, spinach, onion and nutmeg and mix well. Pour into dish and smooth the top.

Bake at 350 for 50-60 minutes, checking carefully to see that it doesn’t over brown. Let cool and cut into squares.