Spinach Bread

My friend Lorita sent me this recipe. I'm going to make it as soon as I buy some French bread. I think my family will like it.

Spinach Bread

1 loaf French bread, split
1/4 lb butter, melted
1 onion, chopped
4 oz Cheddar cheese
4 oz Mozzarella cheese
1 box frozen spinach, chopped

Sauté chopped onion in butter, add cheddar and Mozzarella cheese until melted. Add 1 box of boiled chopped spinach to cheese mixture. Quickly put on to French bread and bake at 350F for about 10 to 15 minutes, or until bubbly.