01 - Preheat the oven to 375°F. Lightly grease a baking dish with 1 tablespoon of olive oil.
02 - Arrange the pepper halves cut side up in the prepared baking dish. Drizzle with the remaining olive oil and season lightly with salt and pepper.
03 - In a large mixing bowl, combine the ricotta, Parmesan, spinach, parsley, basil, chives, garlic, lemon zest, salt, black pepper, and egg. Stir until smooth and thoroughly blended.
04 - Spoon the ricotta filling evenly into each pepper half, pressing gently to ensure they are well filled.
05 - Sprinkle shredded mozzarella over the stuffed peppers, if desired.
06 - Cover the baking dish tightly with aluminum foil and bake for 25 minutes.
07 - Remove the foil and continue baking for 10 additional minutes, until the peppers are tender and the filling is lightly golden on top.
08 - Allow the peppers to rest for 5 minutes before serving.