Preheat oven to 375°F (190°C).
In a large bowl, combine the cooked lentils, breadcrumbs, Parmesan cheese, garlic, and onion.
Add the olive oil, oregano, basil, salt, and pepper. Mix well.
Add the egg and mix until well combined.
Form the mixture into small balls and place them on a baking sheet lined with parchment paper.
Bake in the preheated oven for 25 minutes, or until the meatballs are golden brown and firm.
Serve with your favorite pasta sauce or as an appetizer with dipping sauce.