Greek Style Green Beans

Ok, so this recipe isn't mine. I got it from a place I went to volunteer. But here it goes:

1 pkg frozen green beans
2 diced medium onions
3 diced large tomatoes
3 cloves of garlic
salt and pepper to taste
1 8 oz jar of feta cheese
3 tablespoons olive oil

Saute the chopped garlic until golden. Add onions and cook until clear. Add tomatoes and let simmer 5 minutes on medium high heat. Add green beans and cook 10 additional minutes. Remove beans from heat and sprinkle with feta cheese.