In a large mixing bowl, combine the spinach, heavy cream, Parmesan cheese, mozzarella cheese, melted butter, salt, pepper, and minced garlic. Mix well.
Transfer the mixture to a greased baking dish.
Bake in the preheated oven for 25-30 minutes, or until the top is golden and bubbly.
Remove from the oven and let it cool for a few minutes before serving.
Notes:
For a bit of crunch, you can add some breadcrumbs on top before baking.