Add all ingredients (except pumpkin seeds) into a slow cooker and stir well
Cover and cook for 3-4 hours on high or 5-6 hours on low. Turn off slow cooker when done
Using an immersion blender, puree soup in the slow cooker until smooth. Scoop with a ladle and add into a mixer or blender in batches if you do not have an immersion blender
Serve warm and sprinkle pumpkin seeds or your favorite topping on top. Enjoy!