Sweet Potato Gratin

Ingredients (12)

• 2 pounds sweet potatoes,
• 2 tablespoons all purpose flour
• salt and fresh ground pepper,
• 1/4 teaspoon ground ginger
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon chili powder OR ground red pepper
• 1 teaspoon dried thyme
• 1 can (12 ounces) evaporated milk
• 1/4 cup grated parmesan cheese
• 1/2 cup grated swiss cheese or gruyere cheese
• grated parmesan cheese for garnish
• dried parsley for garnish