Boil spaghetti in salted water until soft, then drain and set aside. In a pan, heat a little oil and saute sliced sausage pieces until lightly browned, bacon then add sliced onions, bell peppers, and a few peas; cook until soft. Add garlic (optional), salt, black pepper, turmeric, cumin, and a little chili powder or sauce for flavor. Toss in the cooked spaghetti and mix well, so everything is coated, adding a splash of pasta water or a bit of oil if needed. Finish with chopped green onions.