Hamburger-Broccoli Alfredo Casserole

In a large skillet, brown the hamburger and onion, seasoning with salt and pepper; drain the fat. Meanwhile, cook the broccoli until tender-crisp; drain very well and season with salt and pepper. Put the cream cheese in a microwaveable bowl and microwave on HIGH about 45 seconds until soft. Whisk until creamy and smooth. Gradually whisk in the cream until smooth, then stir in the parmesan cheese and garlic powder. Mix the hamburger and broccoli in a large, greased casserole, 2 1/2 quarts or larger. Pour in the cream sauce and mix well. Season to taste with salt and pepper. Bake at 350º for about 35-45 minutes, until bubbly and browned on top.