Preheat the oven to 375 and butter or use non stick cooking spray in a 9×13 casserole dish.
In a large bowl stir together the eggs, mayo and cream of mushroom soup until well blended
2 Eggs, 1 Cup Mayonnaise, 1 10.5 oz Can Cream of Mushroom Soup
Add in the chopped onion, 1 cup of the shredded cheese, and shredded chicken, stir to combine until the chicken is evenly coated with the sauce mixture.
2 Cups Cooked Shredded Chicken Breast, 2 Tbsp Finely Chopped Onion, 1 Cup Shredded Cheddar Cheese
Evenly spread the broccoli across the bottom of your prepared baking pan.
3 Cups Steamed Broccoli
Pour the chicken and sauce mixture evenly across the broccoli.
Spread the remaining cup of cheddar cheese across the top of the chicken.
1 Cup Shredded Cheddar Cheese
Place the casserole in the oven and bake uncovered for 35-40 minutes or until golden brown and the cheese is melted and bubbly.
Serve warm, store any leftovers refrigerated in an airtight container.