Baked Ziti

I got this from a friend's recipe blog.  Made a couple adjustments for my family's size and preferences.  Really good and really easy!

1/2 lb ground sausage
1/2 jar marinara/pasta sauce
1 c shredded cheddar cheese
1-1.5 c dry pasta of choice
1/2 t minced garlic (optional)
dash onion, minced (optional)
1/4 c sour cream
1 c shredded mozzarella cheese

Brown meat with garlic and onion.  Drain.  Cook pasta.  Drain.  In a bowl, combine sauce, cheddar cheese, sour cream and half mozzarella cheese cheese.  Add meat and pasta.  Mix well.  Pour into baking dish.  Top with the rest of the mozzarella cheese.  Cook at 350 for 30-45 minutes, covered or uncovered as you prefer.