Cheesy Broccoli Casserole (Low carb friendly)

1 (10 1/2 ounce) can cream of low sodium mushroom soup
1 cup light mayonnaise
1 beaten egg
1/4 cup chopped onion
1 (14 ounce) package frozen chopped broccoli
8 ounces reduced fat or fat free sharp cheddar cheese, shredded
Garlic salt and pepper
paprika

Mix together the soup, mayo, egg and onion.
In a large bowl, fold the broccoli and the soup mix and the cheese together. And season.
Spread into a greased 9x13 inch pan.
Sprinkle with paprika.
Bake at 350 for 45 minutes.