Meanwhile, heat the oil in a large saucepan over medium-high heat. Once hot, add the onion, and cook, stirring frequently, until browned, about 20 minutes. Add red pepper, zucchini, green chiles, green onion, and crumbles, and continue to cook, about 5 minutes. Add taco seasoning and salsa and stir to combine. Remove from heat, and stir veggie mixture into pasta. Set aside.