Preheat oven to 375°F (190°C).
Squeeze the thawed spinach in a kitchen towel until no liquid remains.
In a large bowl, mix cream cheese, sour cream, mayo, garlic, and spices until smooth.
Fold in the dry spinach, chopped artichokes, and half of the Mozzarella and Parmesan.
Spread the mixture into a 1.5-quart baking dish.
Top with the remaining Mozzarella and Parmesan cheese.
Bake for 20–25 minutes until the top is golden and the edges are bubbling.
Let rest for 5 minutes before serving warm.