Baked Penne with Meatballs

I got this recipe from For the Love of Cooking. And it turned out really great. I just used Costco's frozen meatballs instead of making my own, but if you want to make your own, she tells you how. And I changed a couple other little things to. So here you go:

Ingredients

2 tsp olive oil

1/2 sweet yellow onion, diced
3-4 cloves of garlic, chopped finely
1 15 oz can of crushed tomatoes
1 15 oz can of tomato sauce
1 tsp balsamic vinegar
1 tbsp parsley
1 tsp  basil
1 tsp  oregano
1 tsp white sugar
1 pinch of red pepper flakes
Salt and fresh cracked pepper to taste

Penne pasta, prepared per instructions (we used a little over half a bag -- probably 5 servings)
1 cup of mozzarella cheese, shredded (I actually would have liked more cheese)
1/4 cup of Parmesan cheese, shredded

Meatballs (we probably added about 25)

1.Saute onions in olive oil, until tender.

2. Add garlic and cook for 60 seconds, stirring frequently. (get ready for a delicious smelling kitchen)

3. Add garlic, onion and remaining sauce ingredients to crock pot. (You could probably just simmer it in a large pan)

4. Cook on high for 2 hours (I only cooked it about 1)

5. Add defrosted meatballs.

6. Preheat oven to 350 degrees.

7. Cook the pasta, according to instructions on package and drain. 

8. Pour the pasta and sauce into casserole dish.

9. Mix in the cheese, putting the most on top.

10. Bake for 30 minutes.