Preheat oven to 350F. Cook pasta 1-2 minutes less than indicated.
Heat a large, oven-proof skillet over medium-high heat. Add olive oil, cook sausage for 5 minutes, flipping halfway through, remove from pan and set aside. Add bell peppers, cook another 5 minutes. Add sausage, marinara sauce and chill flakes. Toss cooked pasta with sauce. Sprinkle with cheese and bake for 20 minutes.
Remove from oven and sprinkle with fresh basil, serve.
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