Cook the sausage in a large pot over medium heat until browned.
Remove the sausage from the pot and set aside, leaving the drippings.
Add the chopped onion and sliced bell peppers to the pot.
Stir in the minced garlic and cook for an additional minute.
Return the sausage to the pot and add the diced tomatoes, chicken broth, and Italian seasoning.
Bring the mixture to a boil, then add the penne pasta.
Reduce the heat to low and cover, cooking until the pasta is al dente, about 12-15 minutes.
Season with salt and pepper to taste, and remove from heat.
Garnish with fresh basil before serving.