Gather all ingredients.
Heat oil in a wok or large skillet over medium-high heat. Stir in garlic; cook until edges begin to brown, about 20 seconds.
Add green beans; cook and stir until they begin to soften, about 5 minutes.
Stir in oyster sauce, sugar, and soy sauce.
Cook and stir until beans have attained the desired degree of tenderness, 2 to 4 minutes.
