Gather all ingredients.

Place a steamer insert into a saucepan and fill with water to just below the bottom of the steamer. Bring water to a boil. Add green beans, cover, and steam to your desired degree of tenderness, about 5 minutes.

Transfer steamed green beans to a serving bowl. Add olive oil, Parmesan cheese, white wine vinegar, garlic, salt, and pepper; toss until evenly coated. Let stand for 10 minutes.

Remove garlic slices and garnish with parsley before serving.

Serve and enjoy!