Peel and finely chop the onions and garlic cloves. Rinse the thyme, shake dry, and finely chop.
In a large bowl, combine the minced beef, chopped onions, garlic, and breadcrumbs.
Beat the egg in a small bowl, then add to the beef mixture along with the chopped thyme, paprika powder, salt, and pepper. Knead everything together until well combined.
Shape the mixture into rolls about finger-thick (roughly 2 cm diameter) and 5 cm long.
Heat the olive oil in a large pan over medium-high heat. Fry the rolls, turning occasionally, until browned on all sides and cooked through (internal temperature 71 °C / 160 °F), about 8–10 minutes.