creamy roasted winter vegetable soup or chowder

Ingredients

• 3 small potatoes (i used russet) peeled and cut into chunks
• 1 - sweet potato, peeled and cut into chunks
• 1 small head of cauliflower, cut into chunks
• 1/2 - head of broccoli, cut into chunks
• 3 - leeks, white part only, rinsed well and sliced
• 1 - medium onion, cut into chunks
• 3 large garlic cloves, peeled
• 1 large carrot, cut into chunks
• 1 - stalk celery, cut inot chunks
• 3 tablespoons olive oil
• 1 teaspoon dried thyme
• 1/2 teaspoon dried sage
• 1/2 teaspoon coriander powder
• - large pinch kosher salt
• - fresh ground black pepper
• 1 1/2 to 2 quarts vegetable broth
• 1/2 cup dry white wine
• 2 tablespoons butter
• 1 cup milk
• 1 cup defrosted frozen corn