Artichoke Spinach Dip

Directions

1. In a large bowl, combine mayonnaise, sour cream, parmesan, 1/2 cup of mozzarella, mustard and pepper. Stir in artichoke hearts, spinach and onion.
2. Transfer mixture to a 1-quart casserole dish and cover, chill for at least 3 hours.
3. Bake at 350 degrees for 30 to 40 minutes or until thoroughly heated.
4. Top with the remaining 1/4 cup of mozzarella.
5. Bake 5 minutes longer or until cheese melts.