Sup Kembang Kol Panggang Krim

Bahan-bahan (6 porsi)

• 1 head cauliflower
• 2 Tbsp extra virgin olive oil ((for roasting))
• 2 tsp Diamond Crystal kosher salt ((for roasting))
• ⅛ tsp freshly ground black pepper ((for roasting))
• 2 leeks ((white and light green parts only))
• 5 mushrooms ((I use cremini))
• 2 Tbsp unsalted butter
• 2 cloves garlic
• 1 bay leaf
• ¼ tsp Diamond Crystal kosher salt ((for sautéing the leeks))
• 1 tsp thyme ((fresh))
• 3 Tbsp all-purpose flour (plain flour)
• 2 cups milk ((I use whole milk))
• 3 cups vegetable stock/broth ((you can substitute chicken broth))
• Diamond Crystal kosher salt ((to taste))
• freshly ground black pepper ((to taste))
• ½ –1 cup shredded sharp cheddar cheese
• chives ((optional; for garnish))
• 1 tsp extra virgin olive oil ((for garnish))