Heat olive oil over low-to-medium heat in a Dutch oven. Add carrots, celery, turnip, onion, garlic, leek, green beans and cauliflower. Cook 2–3 minutes or until onion is slightly translucent, stirring continuously.
Add vegetable stock and bouillon, increase to medium-high heat and bring to a boil. Reduce heat and simmer about 5 minutes
Continue to simmer until turnip is soft enough it can be easily pierced with knife, about 15 minutes.
Remove from heat and purée in blender or food processor, working in batches if necessary (be careful of steam–it can blow off the lid of the blender).
Return puréed soup to Dutch oven and bring to simmer again, adding more broth or stock to adjust consistency if necessary. Season with salt and pepper to taste.
As soup finishes, prepare crostini by spreading butter on sliced baguette. Top with blue cheese and broil 1-2 minutes.
Garnish soup with crostini and serve immediately. Enjoy.
Notes
I'm just obsessed with Better Than Bouillon for homemade soups. It really lives up to its name!