In a large bowl, combine ground beef or lamb with grated onion and minced garlic.
Add breadcrumbs, parsley, oregano, salt, and pepper to the mixture.
Incorporate the beaten egg into the mixture until well combined.
Shape the mixture into golf ball-sized meatballs.
Heat olive oil in a skillet over medium heat.
Add the meatballs in batches, ensuring they don't crowd the pan.
Cook for about 5-6 minutes on each side until browned and cooked through.
Remove meatballs from skillet and let them drain on paper towels.
Serve immediately or store for later use.
Enjoy with a side of tzatziki sauce or salad!