Spinach and Feta Pasta

This is a recipe that I got off of this website. Check it out if you get a chance. All of their recipes look amazing and this one was yummy, quick and low fat.

8 oz. penne pasta
1 (28 oz.) can diced tomatoes
3 c. fresh spinach (you don't have to chop it)
1 onion, finely chopped
5-6 cloves garlic, minced
A handful of mushrooms, chopped (we don't like mushrooms so I left them out and it was still good.)
4 oz. crumbled feta cheese
salt and pepper to taste

Bring a large pot of salted water to a boil and add pasta. Cook according to package directions. In the meantime, heat a little olive oil in a skillet over medium heat. Add onions, garlic and mushrooms and cook until tender. Add spinach and cook until wilted. Add tomatoes, heat through, and then add drained pasta and crumbled feta. Add salt and pepper to taste. Heat through and serve; you can crumble a little extra feta on top if you feel the urge!