Preheat your oven to 375 degrees
Add 2 cups of chicken stock into a saucepan over medium high heat and bring to a simmer
Once the stock is simmering, add a cup of orzo, reduce the heat to medium low, cover and cook for 12 minutes
While the orzo is cooking, cook 16 ounces of Italian sausage until it is browned and cooked through
Transfer the cooked sausage into a bowl and set aside for now
Add 2 tablespoons of butter into the skillet you cooked the sausage in and as soon as it has melted, add 2 minced cloves of garlic and a diced yellow onion and cook for about 5 minutes or until they are softened
Transfer the skillet off of the heat and add the browned sausage back into the skillet along with 1/4 cup of finely chopped fresh parsley, 1/2 cup of finely shredded parmesan, 14.5 ounces of diced tomatoes and the cooked orzo
Mix the filling well and test to see if salt or black pepper is necessary
Prepare the peppers by cutting them in half lengthwise or cutting off the tops and removing all seeds and membranes
Place the peppers into a baking dish and drizzle with olive oil
Divide the filling between all of the peppers and top with additional shredded parmesan, if desired
Carefully pour the remaining 1/2 cup of chicken stock in between the peppers (be careful not to pour it into the peppers)
Bake uncovered in a 375 degree oven for 40-45 minutes or until the peppers are tender and the parmesan is melted
Garnish with fresh parsley and enjoy!