1/2 cup butter, melted
1 cup all-purpose flour
1 teaspoon salt
1 teaspoon baking powder
1 cup milk
2 (10 ounce) packages frozen
chopped spinach, thawed and squeezed dry
4 cups shredded Monterey Jack cheese
Pour butter into a 13-in. x 9-in. x 2-in. baking dish; tilt to coat. In a bowl, combine the flour, salt and baking powder. Whisk eggs and milk; stir into dry ingredients just until blended. Fold in spinach and cheese. Pour into prepared dish.
Bake, uncovered, at 350 degrees F for 30-35 minutes or until a knife inserted near the center comes out clean. Cool for 5 minutes; cut into small squares. Serve immediately or transfer to a freezer container. May be frozen for up to 3 months.