Thaw spinach overnight in the refrigerator. (Note: Place the boxes in a bowl as they have a tendency to leak when thawed.) If time doesn’t permit, you can heat the spinach in a microwave for several minutes – just read the instructions on the side of the package.
Spray a 3- to 5-quart slow cooker with nonstick baking spray.
Using several paper towels, squeeze excess moisture from the spinach and place in the slow cooker.
Add remaining ingredients except for cream cheese (green onions, garlic, lemon juice, Parmesan, sour cream, Monterey Jack cheese, artichokes, salt and paprika).
Sprinkle cream cheese evenly on top of other ingredients.
Cook on HIGH for 2 hours. Stir mixture until well combined.