**Ingredients:**

– 2 pounds of potatoes, peeled and cut into quarters

– 8 cups of water

– 1½ tablespoons of salt (for boiling)

– 2 ounces (4 tablespoons) of butter

– 1 egg, beaten

– 1 tablespoon of cornstarch (for coating)

– ½ teaspoon of salt (for the mixture)

**Instructions:**

1. **Boil the Potatoes:** In a large pot, bring the 8 cups of water to a boil. Add 1½ tablespoons of salt and the quartered potatoes. Boil for 20 minutes or until the potatoes are tender.

2. **Prepare the Mixture:** Drain the potatoes and then mash them in a large bowl. Add the butter, beaten egg, and ½ teaspoon of salt. Mix well and let the mixture cool in the refrigerator.

3. **Shape the Filling:** Once the potato mixture has cooled, divide it into 12 equal parts. 

4. **Form the Balls:**

   – Sprinkle cornstarch on the palm of your hand to prevent sticking.

   – Take one portion of the potato mixture and spread it across your palm.

   – Press the center with your fingers to create a small indentation.

   – Place a small amount of filling (such as cheese, if desired) into the indentation.

   – Gently cover the filling with the potato mixture and shape it into a ball, adding more cornstarch as needed to prevent sticking.

   – Repeat this process until you have formed all 12 filled balls.

5. **Fry the Balls:** Heat plenty of oil or butter in a frying pan until it reaches 350°F. Carefully add the potato balls and fry them until they are golden brown. 

6. **Serve and Enjoy!** 

You can customize the filling based on your preferences, such as using cheese.