Beans and Bowties

I was inspired by this recipe, but by the time I was done with "my version" it was different enough that I'm going to claim it as my creation. And it's a good one :) I was quite pleased with myself--but, I can't take too much credit since the secret ingredient is Costco's Fresh Basil Pesto. But shhhhhh, you didn't hear that from me.
Stewed Beans and Bowties
1 can great northern beans
1/2 lb (half a box) bowtie pasta (I found a box of mini bowties--the girls called them butterflies)
1 can stewed tomatoes, chopped
1 small onion, finely chopped
1 clove garlic, minced
1 tsp dried oregano
1/4 tsp salt
1 cup mozzarella cheese, shredded
fresh spinach, chopped
1 cup fresh bread crumbs
pesto

1. Cook pasta al dente according to directions. Drain and reserve 3/4 cup pasta water.
2. Saute onion and garlic in 2 Tbsp olive oil until translucent. Add tomatoes with juice, oregano, salt, and reserved liquid. Simmer until reduced and thickened.
3. Drain and rinse beans. Put in a 9x9 baking dish with pasta, spinach and shredded cheese.
4. Pour sauce over bean mixture. Cover and bake at 350 degrees for 30 minutes.
5. Toast bread crumbs in 2 Tbsp olive oil until browned and crisp. Salt if desired.
6. Remove beans and pasta from oven. Top with small dollops of pesto and breadcrumbs. Bake an additional 3 to 4 minutes.
Enjoy!