Meanwhile, heat spaghetti sauce, tomatoes, and capers.
Once the sauce is bubbling, add spinach and cook until soft.
Drain the pasta and palce in a greased 9×13 pan. Pour the sauce over the pasta and mix to combine. Cover with aluminum foil and bake at 350 F for 15 minutes.
Uncover, sprinkle with cheese, and bake, uncovered, until the cheese is melted.