Potato Cheddar Puff Pastry Turnovers

Name: Potato Cheddar Puff Pastry Turnovers
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: European, American
Ingredients: 10 puff pastry squares; 1.5 cups potatoes (cut into small cubes); 1 cup cheddar (grated); 1 red onion (finely diced); 3 fresh red chilies (finely diced, or substitute 0.5-1 teaspoon chili flakes); 1 teaspoon summer savory (or substitute equal amounts dried thyme and oregano); 0.5 teaspoon black pepper; 0.5 teaspoon salt (or to taste, see recipe notes); 1 egg (for eggwash)