Preheat oven to 350°F. Heat broccoli cuts until soft. Combine soup, mayo, lemon juice, and steak seasoning in medium bowl.
Arrange broccoli in a casserole dish or baking pan. Spread almost half of the sauce over the broccoli evenly. Place chicken breasts on top on the broccoli and sauce and cover the chicken with the rest of the sauce. Top with your choice of shredded cheese.