Ayam Potpie

Bahan-bahan (2 porsi)

• 2 tablespoons all-purpose flour (plus more for surface)
• 1 package frozen puff pastry (preferably all butter, thawed)
• 2 tablespoons unsalted butter
• 1/2 cup onion (diced)
• 1/3 cup small carrot (peeled and thinly sliced)
• 1/3 cup celery stalk (thinly sliced)
• 1 small Yukon Gold potato (scrubbed and cut into a 1/2-inch (1.3cm) dice)
• 1 1/4 cups low-sodium chicken broth
• 1 cup collard-green leaves (packed coarsely chopped )
• 8 oz (225 grams) boneless, skinless chicken breast (cut into 1-inch chunks)
• Coarse salt and freshly ground pepper
• 1 large egg (lightly beaten)