Spicy Sweet Potato Empanadas

Name: Spicy Sweet Potato Empanadas
Ingredients: 1 pound sweet potatoes, scrubbed (2 potatoes); Good olive oil; 1/4 cup sour cream; 1 1/2 tablespoons unsalted butter, diced; 1 1/2 tablespoons pure Grade A maple syrup; 1/2 teaspoon chipotle chile powder; 1/2 teaspoon grated orange zest; 2 tablespoons freshly squeezed orange juice; Kosher salt and freshly ground black pepper; 2 sheets (1 box) frozen puff pastry, such as Pepperidge Farm, defrosted in the refrigerator; 1 egg beaten with 1 tablespoon of water, for egg wash; Flaked sea salt, such as Maldon