This is the best baked ziti I have ever tried...and I have tried a lot. This is from the March 2009 issue of Cook's Illustrated and has been thoroughly tested by them.
02Meanwhile, heat oil and garlic in 12 inch skillet over medium heat until garlic is fragrant but not brown. Stir in tomato sauce, diced tomatoes, and oregano; simmer until thickened, about 10 minutes. Off heat, stir in 1/2 cup basil and sugar, then season with salt and pepper.
03Stir cornstarch into heavy cream in small bowl, transfer mixture to Dutch oven set over medium heat. Bring to simmer and cook until thickened, 3 to 4 minutes. Remove pot from heat and add cottage cheese mixture, 1 cup tomato sauce and 3/4 cup mozzarella, then stir to combine. Add pasta and stir to coat.
04Transfer pasta mixture to 13 x 9 inch baking dish and spread remaining tomato sauce evenly over pasta. Sprinkle with remaining 3/4 cup mozzarella and remaining 1/2 cup Parmesan over top. Cover baking dish tightly with foil and bake for 30 minutes.
05Remove foil and continue to cook until cheese is bubbling and beginning to brown, about 30 minutes longer. Cool for 20 minutes. Sprinkle with remaining 3 Tablespoons basil and serve.