In large Sautee pan, add 1 tablespoon of EVOO and the diced onions. You want to "sweat" the onions until semi translucent and softened. I like mine a little brown.
Add in all of your yellow squash and cracked pepper, then place a lid on it while on a medium low flame. Stir the squash every few minutes to mix the flavors around. Your squash should be done in about 20 minutes. They will be super soft and somewhat mushy.
Pre-heat oven to 375
Drain 1/2 the liquid from the sauteed squash. Place back on flame and add in your cream of mushroom soup. Stir your squash mixture until the soup and squash come to a harmonious mixed balance.
Place squash mixture into a casserole dish.
Sprinkle shredded cheese over the whole top portion.
Then add your layer of crumbled crackers on top, and spread evenly around.
Place in oven and bake for 15 minutes