In a large skillet, sauté onion and garlic in butter until onion is tender. Stir in tomatoes with juice and seasonings. Bring to a boil; reduce heat. Simmer, uncovered, for about 20 minutes. Stir in capers, if using; remove from heat. Meanwhile, measure out half the spaghetti, reserving the rest for another recipe. Cook according to package directions. Drain spaghetti and add to skillet; toss to coat with sauce. Spoon into a lightly greased 9"x9" baking pan. Sprinkle with cheese. Bake at 400 degrees for 5 to 8 minutes, or until bubbly and cheese is melted.
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