Preheat oven to 450°. Combine lemon juice, olive oil, salt, garlic powder, basil, and pepper in a Ziploc bag. Add green beans, close the bag and toss to combine.
Spread green beans in a single layer on a jelly-roll pan lined with parchment paper. Add nuts to the Ziploc bag and shake bag.
Bake for 5 minutes. Add almonds to the pan and bake 5 minutes more, or until beans are tender and browned, stirring occasionally.