Preheat oven to 400 degrees F.
Line a large baking sheet with parchment paper.
Place green beans on parchment paper and drizzle with olive oil. Use hands to massage oil on the green beans.
Sprinkle with kosher salt.
Ensure beans are evenly spread out in a single layer and place in the oven for 20 minutes cook time. Toss green beans halfway through cooking process.
Remove from oven and serve immediately.
