Preheat your oven to 350 degrees Fahrenheit. This temperature is perfect for baking the peppers until they are soft and tender.
Prepare your bell peppers by removing the tops and seeds. Use a paring knife to carefully slice off the tops and scoop out any seeds and white membranes inside. If you can’t get them all out, don’t worry; just make sure the majority is removed.
Season the insides of each pepper lightly with a pinch of salt and pepper, if desired. This will help enhance the flavor of the Easy Stuffed Bell Peppers.
In a 9×13-inch baking dish, place the peppers cut side down. This will help them cook evenly and absorb the flavors from the filling.
Add 1 cup of water to the dish. This moisture will help steam the peppers while baking.
Cover the dish with foil and bake in the preheated oven for 20 minutes. This step, known as par-baking, softens the peppers.
While the peppers are baking, prepare the filling in a large skillet. Start by adding the ground sausage and ground beef to the skillet. Cook over medium-high heat for about 5 minutes, crumbling the meat and stirring frequently until it’s nearly done.
Add the diced onion and celery to the skillet and continue cooking for about 4 minutes until the vegetables are soft and translucent. Stir frequently to avoid burning.
Once the vegetables are soft, add the minced garlic and cook for an additional minute until fragrant.
Next, stir in the marinara sauce, beef broth, Worcestershire sauce, salt, pepper, optional sugar, and dried oregano. Bring the mixture to a boil, then reduce the heat and let it simmer uncovered for about 15 minutes, stirring occasionally.
The goal is to achieve a juicy filling that isn't overly soupy. Remove the skillet from the heat and stir in the cooked rice and Parmesan cheese until well combined.
Carefully remove the peppers from the oven and discard the water. Lightly spray the baking dish with cooking spray to prevent sticking.
Stuff each pepper with the filling, filling them about three-quarters full. Place the peppers in the baking dish with the cut side facing up.
Cover the peppers again with the foil and bake, this time uncovered, for about 25 minutes. Do not add water at this stage.
After 25 minutes, remove the baking dish from the oven and peel back the foil.
Evenly top each pepper with the shredded cheddar cheese. Place the stuffed peppers under the broiler for about 2 minutes or until the cheese is golden brown and bubbling. Watch closely to avoid burning!
Once done, carefully remove them from the oven and serve immediately. Enjoy your delicious Easy Stuffed Bell Peppers!