Baked Ziti

I've been making this for awhile and keep meaning to post it. For me, it rivals lasagna. It is creamier and cheesier than lasagna, which I love. The sour cream doesn't make it taste sour, it just makes it creamier. It originally called for ground beef too, but I prefer dishes like this to be meatless.

Baked Ziti
1 pound dry ziti (or any tube pasta)
1 onion, chopped
1 T. oil
2 (26 oz) jars spaghetti sauce
6 ounces sliced provolone cheese
1 1/2 c. sour cream
1 1/2 c. shredded mozzarella cheese
fresh or frozen spinach (thawed if frozen), to taste
2 T. grated fresh Parmesan cheese

Preheat oven to 350. Cook the ziti until al dente, according to package directions. Drain and set aside.

Meanwhile in a large skillet, cook the onion in the oil over medium heat. Add spaghetti sauce and simmer 15 minutes (or less if you're in a hurry).

Grease a 9x13 dish. Layer as follows: 1/2 of the ziti, provolone cheese, sour cream, 1/2 sauce mixture, spinach, remaining ziti, mozzarella and remaining sauce mixture. Top with grated Parmesan.

Bake for 30 minutes or until cheeses are melted.

Altered slightly from allrecipes.com