Preheat the oven to 350°F. Spray
a large casserole with nonstick cooking spray.
In a large skillet, brown the
ground beef and onion. Add the spinach and cook
until
the meat is done.
In a bowl, combine the cream
cheese, heavy cream, Parmesan, and salt and
pepper to taste. Mix well.
Combine the cream cheese mixture
and the meat mixture, and spoon into the
prepared casserole. Bake, uncovered, for 30
minutes or until bubbly and browned on top.