Sweet Potato Surprise Bake | Cooking Professionally

Ingredients

• 2 tablespoons extra-virgin olive oil
• 3 tablespoons all-purpose flour
• 1 cup whole milk
• 1 cup water
• 1/4 cup plus 1 tablespoon parmesan cheese, freshly grated, divided
• 1 tablespoon sage, chopped, plus 20 whole fresh sage leaves, divided
• coarse salt, to taste
• freshly ground black pepper, to taste
• 2 pounds sweet potatoes, peeled and sliced 1/4-inch-thick
• 1 head cauliflower, quartered and sliced 1/4-inch-thick
• vegetable oil, to taste