Baked Vidalia dip

A warm & cheesy appetizer made with sweet Vidalia onions. I got this one from my mother, but I don't know where it originally came from.

In a large bowl, mix:

1. 1 extra-large sweet onion (1 - 1.5 lbs), sliced into thin half-rings (about 2 cups)
2. 1 c mayonaise (store-bought is fine)
3. 1 c grated sharp Cheddar or Swiss cheese
4. 1/4 - 1/2 t Tabasco

Pack into a medium size cassarole or 9" square Pyrex. Top with:

1. 1/2 c grated Parmesean
2. hot paprika (to taste)

Cover and refrigerate if desired. Just before serving, bake for 30 minutes at 350. Serve hot with crackers or baguette slices.