Adapted from Ina Garten and The Joy of Cooking
1 pound potatoes, diced large
1/2 large onion, sliced
1 lb. snap green beans, ends removed (snapped in half if desired)
1/8 c. olive oil
1 t. salt, plus more to taste
1/2 t. ground black pepper
Preheat oven to 425F. In a large bowl, combine the potatoes and onions. Toss the potatoes and onions with olive oil to coat. Sprinkle salt and pepper. Transfer the coated potatoes and onions to a baking sheet. Bake in the preheated oven for 25-30 minutes, until the potatoes are tender. Toss once while cooking, at the half-way mark. After the potatoes are tender, toss in the string beans to the pan. Bake for another 10-15 minutes, until the beans are tender. Remove from the oven and add more salt and/or pepper if you wish.