The recipe can be found here. I think it would also be lovely to add some avocado, tomatoes, dried cranberries, and matchstick carrots. Maybe even some kale. I used mixed baby greens instead of spinach and really, any salad greens would work well. You could skip the croutons (I did) and make it gluten-free and omit the bacon (but who'd want to?) to make it vegetarian.
So, so yummy.