Using a large pot and a steamer basket or colander that will fit inside, add approximately 1-2 inches of water to the pot and heat over high heat.
Once the water has reached a boil, add the green beans to the steamer basket or colander and cover.
Allow to steam for 6-8 minutes, or until the green beans are starting to become tender but have not finished cooking. Remove from heat and set aside.
Melt butter over medium heat in a large skillet. Add garlic and cook 1-2 minutes.
Transfer steamed green beans to the melted butter and garlic.
Toss to coat green beans evenly and continue to saute for approximately 5 minutes over medium heat.
Season with salt and pepper and add more if necessary, to taste:
Remove from heat and sprinkle grated parmesan. Toss once again until parmesan is melted.