Cook pasta in well salted water, reserve 1 cup pasta water. Heat oil, chili flakes add onion and garlic. Add in mushrooms and cook until softened. Add sausage and cook until browned. Add in peppers, white beans, roasted tomatoes and kale. Cook until kale has wilted. Add cooked pasta, pasta water, cheese and toss to combine. Season well, add basil, check for seasoning.
