Bring a large pot of salted water to a boil. Add the green beans and cook until just tender, 3 to 5 minutes.
Meanwhile, heat the oil in a large skillet over medium heat. Add the garlic and cook, stirring, for 1 minute. Add the pine nuts and cook until golden brown, about 3 minutes. Drain the green beans and transfer to the skillet. Add 1/2 teaspoon salt and 1/4 teaspoon pepper and toss to coat. Transfer to a serving bowl.
Make-Ahead Note: This dish can be partially prepared up to 2 days in advance. Blanch the green beans by boiling until tender. Plunge them into an ice bath to stop the cooking. Drain and refrigerate, covered, until ready to sauté with the garlic and pine nuts. Cook the green beans until heated through.