Brown sliced turkey sausage in olive oil in a large skillet over medium-high heat, about 5 minutes, then remove and set aside.
In the same skillet, sauté chopped peppers, onion, and minced garlic for 4 minutes until softened.
Return sausage to the skillet, add canned tomatoes with juice, white beans, and Italian seasoning, then simmer for 8 minutes.
Taste and adjust seasoning, then serve in bowls or over polenta if desired.