Preheat oven to 350 degrees.
In a small bowl mix oil and a little salt and pepper together.
Slice the peppers across the top. Remove the seeds, ribs and other contents from the inside. Brush the outside and bottom of bell peppers with oil mixture and place in baking dish, cut side up.
Heat a large skillet over medium heat. Add ground beef and break it up using a spatula or meat masher. Season with salt and pepper. Add ground sausage and cook for 5 minutes, or until meat is cooked.
Add the onion, and cook an additional 3 minutes, then add garlic and good for 2 more minutes.
Add the tomato sauce, then stir in dried thyme, dried oregano, sugar. Add cooked rice. Stir everything together, then taste and add as much salt and pepper as you think it may need.
Fill each pepper with meat mixture. Top each pepper with mozzarella and cheddar cheese. Cover loosely with foil and bake in preheated for 50 minutes. Remove foil and bake for an additional 10 minutes.
Sprinkle with fresh parsley and serve.