Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Butter a 9x13 inch baking dish. Dotdash Meredith Food Studios
Whisk condensed soup, mayonnaise, egg, and onions together in a medium mixing bowl until combined. Dotdash Meredith Food Studios
Place frozen broccoli florets into a very large mixing bowl and break it up if necessary; add soup mixture and mix well to coat. Sprinkle with cheese and mix well; spread mixture into the prepared baking dish. Season with salt, pepper, and paprika. Dotdash Meredith Food Studios
Bake in the preheated oven until cheese has melted and the casserole is golden brown on top, 45 minutes to 1 hour. Dotdash Meredith Food Studios
Serve and enjoy! Dotdash Meredith Food Studios
Awesome Broccoli-Cheese Casserole · Dinner Match Lab | Dinner Match Lab