Cook pasta according to package directions, omitting salt and fat.
While pasta cooks, combine oil, garlic, tomatoes, and onion on prepared pan; toss. Broil 4 to 6 minutes. Transfer mixture and any liquid from pan to a blender. Add 2 tablespoons basil and tomato paste; secure blender lid on blender. Remove center piece of blender lid; cover with a kitchen towel. Blend until smooth.
Drain pasta; return to pan. Stir in tomato sauce, salt, pepper, and chicken. Cook over medium heat until heated. Place spaghetti mixture on a serving platter. Chop remaining 2 tablespoons basil leaves. Sprinkle basil and Parmesan evenly over spaghetti.
I liked it well enough to make again. However hubby did not like how the sauce turned out. It did go together easily. I broiled the tomato/onion/garlic mix for 4 minutes then tossed then another 4. That seemed the right amount of time in my oven.
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