In a frying pan, heat olive oil over medium heat. Add onions and garlic, cook until softened.
Add ground beef, cook until browned. Stir in tomato sauce, oregano, salt, and pepper. Simmer for 10 minutes.
In a baking dish, layer half of the sliced plantains. Spread the beef mixture over the plantains. Top with remaining plantains and sprinkle with cheese.
Bake in preheated oven for 30 minutes, until cheese is melted and bubbly.
Let cool for a few minutes before serving.
Notes:
Pastelon is a great dish for family gatherings. You can prepare it ahead of time and bake it when ready to serve.