Bake. Preheat oven to 400 F. Toss green beans in olive oil, salt, and pepper, and lay in a single layer on a rimmed baking sheet. Bake in the preheated oven for 26-28 minutes. Remove baking sheet from the oven, and evenly sprinkle the garlic over the top. Toss to incorporate. Return to the oven for 5 minutes-- you'll know the green beans are done once they've browned around the edges.
Assemble + enjoy. Top with freshly zested lemon and enjoy!