Cook rice according to package instructions. You should have 1 cup of cooked rice in the end.
Preheat oven to 375 degrees. Prepare 2 large glass baking dishes with nonstick cooking spray.
Add water to a large pot and bring to a boil.
Cut the tops off the peppers and wash and clean out the insides. Cut each pepper in half, lengthwise.
Add the peppers to the boiling water and cook for 5 minutes. Carefully remove the peppers from the water and set them into the glass baking dishes.
In a large skillet over medium-high heat, add the onion and ground beef. Break apart the beef and cook until no longer pink, about 8 minutes. Drain excess grease.
Add diced tomatoes, garlic powder, Italian seasoning, cumin, salt, and black pepper to the ground beef mixture. Cook until tomatoes start to break down and soften, about 5 minutes.
Turn off the heat and add in the rice and tomato sauce, mixing until everything is fully incorporated.
Fill each pepper with the ground beef filling and top with cheese.
Bake for 20-25 minutes. Enjoy!
Notes
Feel free to replace the ground beef with ground turkey for a lower-fat dish.