Florida Sweet, Gold and Purple Potato Bake - Fresh From Florida : Fresh From Florida

Ingredients

• 2 pounds Florida sweet potatoes, purple and orange, peeled and sliced into ⅛-inch thick rounds
• 2 pounds Florida potatoes, gold, red and purple, sliced into ⅛-inch thick rounds
• 2 tablespoons unsalted butter, melted
• 1 tablespoon virgin olive oil
• 4 cups onions, sliced thin
• ¼ cup parmesan cheese, grated
• 1 teaspoon fresh thyme (plus more for garnish), leaves removed from stem and chopped fine
• Sea salt and fresh ground pepper, to taste