For a vegan version, substitute the butter with olive oil and the chicken broth with vegetable broth. Use a vegan cream cheese alternative. If you don't have an immersion blender, you can carefully blend the soup in batches using a regular blender. Be sure to vent the lid to prevent pressure buildup. Fresh dill can be used in place of dried, use 1 tablespoon of fresh dill, chopped. This soup freezes exceptionally well. Allow it to cool completely before transferring it to freezer-safe containers. It will keep for up to 3 months.