Start by washing the bell peppers and cutting off their tops. Remove the seeds and membranes carefully to create space for the filling. Lightly brush them with olive oil and place them in a baking dish.
In a bowl, mix feta, mozzarella, ricotta, chopped olives, garlic, parsley, and oregano. Stir everything until well combined and creamy. Taste the mixture and adjust seasoning if needed.
Spoon the cheese mixture into each pepper, filling them generously but not overpacking. Add a small amount of tomato sauce on top for extra moisture and flavor during baking.
Preheat your oven to 180°C (350°F) and bake the stuffed peppers for about 35–40 minutes. The peppers should become tender, and the cheese should melt beautifully.
Once baked, let the peppers rest for a few minutes before serving. This helps the filling set slightly and enhances the overall flavor.