Heat a large pan to medium heat and add a bit of olive oil. Add the onion and peppers and cook about 5 minutes to soften.
Add the garlic and stir. Cook another minute.
Add the Italian sausage and break it apart with a wooden spoon. Cook it down, stirring a bit, about 5 minutes, or until it is cooked through.
Add the paprika, tomato sauce, basil and salt and pepper to taste. Stir. Reduce heat and simmer about 10 minutes or longer.
Bring a large pot of water to boil and boil the halved peppers about 5 minutes to soften.
Remove from heat and garnish with parsley and chili pepper flakes.
Heat Factor: Medium, though these have a TON of flavor. Easily add more heat with spicier chili flakes and/or hot sauce.