Make sure your frozen spinach is thawed and drained of all excess water.
In a large bowl, add in softened cream cheese, thawed spinach, can of drained artichoke hearts, marinated artichoke juice, marinated drained artichoke hearts, chopped garlic, dried minced onion, cheesoning, crushed red pepper flakes, mayo, and sour cream. Mix that all together until combined.
Then, add in salt, cracked black pepper, grated pecorino romano, and shredded mozzarella. Fold everything together until combined.
Transfer the spinach dip into a baking dish and sprinkle some more cracked black pepper over the top. Bake in the oven at 375°F for 30 - 35 minutes or until hot and bubbly. Serve in a bread bowl or with chips.
