Ham and Leek Empanadas | The Single Gourmand

Ingredients

• 1½ Tablespoons unsalted butter
• 1½ cups small-diced leeks, white and light green parts
• ⅓ cup crème fraîche
• 4 ounces (¼-inch-diced) smoked ham, such as Black Forest
• 4 ounces grated Gruyère cheese
• 2 ounces fresh baby spinach, coarsely chopped (2 cups)
• 2 Tablespoons julienned fresh basil leaves
• ½ cup freshly grated Parmesan cheese
• kosher salt and freshly ground black pepper
• all-purpose flour
• 3 sheets frozen puff pastry, defrosted (2 packages)
• 1 egg beaten with 2 Tablespoons milk, for egg wash
• Fleur de sel or sea salt