Melt the butter in a saucepan. Add the chopped spinach, cook for 2 minutes, until wilted. Add salt, pepper, garlic and nutmeg.
Add the cream cheese, with the heat on low, using a wooden spoon or spatula, incorporate the cream cheese into the spinach. Add the cream. Add the artichoke hearts. Mix in 1/2 of the mozzarella cheese.
Transfer to a small oven safe baking dish. Top with the remaining mozzarella and parmesan cheese. Bake for 20-15 minutes at 350 F, until the cheese is bubbly. Serve.