Spinach Artichoke Dip

This is my sister-in-laws recipe and WOW is it GOOD!!!!  I don't like artichoke, but you'ld never know it was in this.  Don't make this unless you're having lots of people over-you will want to eat it by spoonfuls  :-)  Absolutely delicious!

The following is approxomate because she didn't measure...

2 c. of cooked, chopped spinach
2 c. artichoke hearts - probably 1 can chopped
2 pkg. of Queso Blanco cheese or Monteray Jack cheese, grated or shredded
1 pkg. of shredded Parmesan cheese
1/2 finely chopped onion
4-6 heaping T. of mayo
enough milk to make it all creamy not liquidy

Bake in a oven safe dish at 360-370 degrees for 15 minutes or til cheeses melt.

P.S.  Tweak to your liking!!