Combine all ingredients EXCEPT brown sugar and Parmesan cheese in the crock pot. Give a quick stir and cook on high for 4 -6 hours or low for 8-10 hours.
Puree sauce to desired consistency using an immersion blender (or by carefully transferring to an upright blender).
Optional: stir in sugar and cheese.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.