Gather your ingredients to ensure a smooth preparation process.
If using fresh spinach, wash and chop it finely. If using frozen spinach, defrost and squeeze out excess water.
Drain and chop the marinated artichoke hearts into small pieces.
In your slow cooker, combine softened cream cheese, sour cream, and mayonnaise. Mix until creamy.
Stir in shredded mozzarella and grated parmesan to create a rich, cheesy mixture.
Add minced garlic and dried parsley. Season with salt and pepper to taste.
Gently fold in chopped spinach and artichokes, maintaining some texture.
Cover and cook on low for about 2 hours, stirring occasionally, or on high for about 1 hour.
Once bubbly, stir, taste, and adjust seasoning if necessary. Transfer to a serving bowl and garnish with parsley.