Place a medium to a large skillet over medium-high heat, then add olive oil.
Once the oil is ready, add the Italian sausage, minus the casings.
Cook the sausage for about 4 to 5 minutes.
Add the minced garlic and julienned bell peppers.
Mix, then cook for another 5 to 6 minutes --- mixing often.
Add the crushed tomatoes, salt, pepper, and basil.
Mix to combine everything.
Cover the skillet with a lid, adjust the heat to medium, and then simmer for 15 to 20 minutes.
While it's simmering, bring a pot of salted water to a boil and cook the pasta as instructed in its package.
Add the drained and cooked pasta once your sauce is ready (and seasoned).
Mix to combine the sauce with the pasta.
Add a bit of pasta water, then finish mixing.
Transfer your Italian sausage and peppers pasta into plates.
Serve with some grated cheese and more fresh basil on top, if preferred.