Prepare 1/2 pound spaghetti according to package instructions. Do not use Ziploc® brand Zip'n Steam® bags. Drain spaghetti and set aside.
Combine the tomatoes, tomato paste (or ketchup), olive oil, balsamic vinegar, dried basil, garlic powder and salt in a Medium Ziploc® brand Zip'n Steam® Bag.
Seal bag and shake gently to combine ingredients. Pat ingredients into single layer. Place bag in microwave.
Microwave on full power for 1 minute or until tomatoes are heated through.
Allow bag to stand for 1 minute before handling. Carefully open bag.
Leave tomatoes and sauce in bag. Add 2 Tablespoons grated Parmesan cheese to the bag.
Seal bag and squeeze gently to release juice from tomatoes. Shake gently to combine ingredients.
Pour sauce over cooked spaghetti and toss gently. Garnish as desired with additional grated Parmesan, red pepper flakes, and/or chopped fresh basil.