Can I use milk instead of heavy whipping cream in this recipe?
Absolutely. I will say though that using milk doesn't offer the same richness to the soup that HWC does. Yes, it adds more calories, but I think in this case it's worth it. Also, don't use any type of milk except whole milk. Anything will less fat content will only water down the flavor of the broth and not add any real creaminess to it.