Spinach Casserole

Directions

1. 1
   Cook spinach according to package directions.
2. 2
   Drain well. Beat egg yolks and add to the Cheddar and cream cheeses.
3. 3
   Add flour, margarine, onion, lemon juice, salt and pepper.
4. 4
   Then add 1/4 cup of the Parmesan.
5. 5
   Add drained spinach and mix
6. 6
   thoroughly. Beat egg whites until stiff and fold into the spinach mixture. (Don't add whites until last minute.)
7. 7
   Spray casserole with nonstick spray.
8. 8
   Sprinkle remaining Parmesan over top and bake at 400° for 30 minutes or until knife inserted in center comes out clean.