Byelorussian Kolduny (Potato Pancakes Stuffed with Ground Meat)

Name: Byelorussian Kolduny (Potato Pancakes Stuffed with Ground Meat)
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: European
Ingredients: 2 1/2 ounces ground chicken; 2 ounces ground beef; 2 ounces yellow onion, cut in small pieces; 3/4 teaspoon salt; 1/4 teaspoon ground black pepper; 14 ounces fresh potato, peeled and cut into small cubes; 4 round tablespoons all-purpose flour; 1/2 beaten egg; 2 ounces vegetable oil