In a mixing bowl, combine the cooled mashed potatoes, egg, flour, salt, and pepper. Mix until smooth.

In a separate skillet, sauté the chopped onion and minced garlic until translucent. Add the cooked ground meat and mix well.

Form the potato mixture into small pancakes, placing a spoonful of the meat filling in the center. Fold the potato over to seal.

Heat oil in a frying pan over medium heat. Dust each pancake with extra flour, then fry until golden brown on both sides.

Drain on paper towels and serve hot.