Step 1: Preheat the Oven

1. Preheat Oven: Preheat your oven to 375°F (190°C).

Step 2: Prepare the Peppers

1. Slice the Peppers: Cut the tops off the bell peppers and remove the seeds and membranes. Trim the bottoms slightly if needed so they stand upright.
2. Blanch (Optional): For softer peppers, blanch in boiling water for 3-4 minutes, then drain and cool.

Step 3: Prepare the Ricotta Filling

1. Mix Filling Ingredients: In a mixing bowl, combine the ricotta cheese, mozzarella cheese, Parmesan cheese, egg, Italian seasoning, garlic powder, salt, and pepper. Mix until well combined.

Step 4: Stuff the Peppers

1. Fill the Peppers: Spoon the ricotta mixture into each bell pepper, packing it down gently to fill completely.
2. Top with Marinara Sauce: Place the stuffed peppers in a baking dish and pour marinara sauce over the top of each pepper.

Step 5: Bake the Peppers

1. Cover and Bake: Cover the baking dish with aluminum foil and bake for 25 minutes.
2. Uncover and Brown: Remove the foil and bake for an additional 10-15 minutes, or until the peppers are tender and the cheese is bubbly and lightly golden.

Step 6: Serve

1. Garnish: Remove from the oven and let cool for a few minutes. Garnish with fresh basil or parsley if desired.
2. Enjoy: Serve warm as a main dish or side, with a salad or crusty bread.