Steam beans until tender but still slightly firm. Drain and rinse with cold water to stop cooking. Set aside on a kitchen towel or paper towel to dry off.

In the same saucepan, heat butter until melted, add a drizzle of olive oil to keep the butter from burning. Add nuts and garlic and stir until garlic is tender and fragrant. Add drained beans back in, toss to coat and heat through. Season with salt and pepper.