Roasted Cauliflower Soup with Sourdough Parmesan Croutons

I love all kinds of soups but find that I rarely make them homemade. I have a few favorite recipes that I created long ago that I make often, but other than those few I don't venture out to try new things at home.

A few weeks ago I got a beautiful head of cauliflower in my weekly organics delivery box. (I use Door to Door Organics here in Michigan and I LOVE it!) I rarely cook with cauliflower and honestly I wasn't quite sure what I was going to make at first.