Cook pasta in a large saucepan of boiling salted water as per packet instructions. Drain and keep aside reserving some of the water.
In the meantime, heat oil in a large pan on medium. Sauté onion, garlic and chilli for 4-5 minutes until softened.
Add sausage and cook, stirring, for 2-3 minutes until lightly browned. Add the capsicum and tomatoes, cook on high for 2 minutes and then simmer till the tomatoes have turned mushy; stirring occasionally. Remove from heat and stir spinach through until it starts to wilt.
Add the cooked pasta to the tomato mix; season with salt and pepper. Toss well to combine. Add some pasta water to thicken the sauce.
Garnish with crumbled feta cheese and fresh parsley before serving.
Serve hot.