Creating Classic Stuffed Bell Peppers can be straightforward when you follow these organized steps:

1. Preheat the oven: Start by heating your oven to 375°F (190°C).
2. Prepare the peppers: Carefully cut the tops off the bell peppers and remove the seeds and membranes. Lightly brush the outside with olive oil if desired.
3. Cook the filling: In a large skillet over medium heat, add the ground beef and cook until browned. Drain excess fat.
4. Add vegetables and spices: Stir in the chopped onion and minced garlic. Cook until the onion is soft.
5. Mix in the other ingredients: Add the cooked rice, diced tomatoes, oregano, cumin, salt, and pepper. Stir to combine and cook for another 2-3 minutes.
6. Stuff the peppers: Fill each bell pepper with the meat mixture, pressing down gently to pack it in.
7. Top with cheese: Sprinkle cheese generously on top of each filled pepper.
8. Bake: Place the stuffed peppers upright in a baking dish. Pour about a half-cup of water into the dish to help steam the peppers. Cover with foil and bake for 30 minutes.
9. Uncover and bake: After 30 minutes, remove the foil and bake for an additional 10-15 minutes or until the cheese is bubbly and golden.
10. Garnish and serve: Once baked, remove from the oven, and garnish with freshly chopped parsley or basil before serving.

These steps will guide you in creating incredibly flavorful Classic Stuffed Bell Peppers that are perfect for any meal.