Cheesy Baked Onion Dip

12 to 16 ounces fresh or frozen chopped onions
24 ounces cream cheese, softened
2 cups grated Parmesan cheese
1/2 cup mayonnaise

Preheat oven to 325 degrees F.

Stir together all ingredients until well blended. Transfer to a shallow 2-quart dish. Bake about 15 minutes or until golden brown.

Serve with corn chips or assorted crackers.

NOTE: This can be prepared ahead.