Anita's Crockpot Mac And Cheese

1 16 0z. Box Macaroni
1 - Medium Onion, Diced
1 - Cup Mayonnaise
2 - Cans Cream Of Mushroom Soup
2 - Cans Sliced Mushrooms
2 - Jars Chopped Pimentoes
1 - 8 Oz Package Shredded Sharp Cheddar Cheese
1 - 8 0z Package Shredded Mozzarella Cheese
1 - 16 Oz Shredded Cheddar Cheese
Crushed Ritz Crackers
Oleo Or Butter

Boil Macaroni According To Package Directions. Drain. Mix All Ingredients Gently Till Smooth. Bake @ 350’ For 35 Minutes Or 6 Hours On High In A Crockpot. Place Ritz Crackers And Dots Of Butter On Top.

**this Is Excellent Tasting And Great For A Crowd. We Always Make It At Family Gatherings.