Sauté onion in oil until soft, then add garlic. Add ground meat, paprika, salt, and pepper. Cook until browned. Stir in parsley (optional). Let cool.
Mix mashed potatoes, egg, flour, salt, and pepper into a soft dough. Add more flour if sticky.
Dust hands with flour. Flatten 2 tbsp dough, add 1 tbsp meat filling, seal, and shape into patties.
Fry in hot oil, 3–4 minutes per side until golden. Work in batches.
Serve hot with sour cream or your favorite dip.