Add spinach, onion, green onions, and garlic to bowl of a 12 cup food processor. Cover and pulse until well blended.
Add cream cheese, artichoke hearts, and spices to spinach mixture. Cover and pulse again until well blended.
Add parmesan cheese, jalepenos, and mozzarella cheese. Cover and pulse again until well blended.
Transfer mixture to crockpot. Cook on low for 4 hours, stirring once or twice, then keep warm. Serve with crackers, tortilla chips, or baguette slices.