Preheat oven to 425F and line a baking sheet with parchment paper.
Season:
In a small bowl, combine Parmesan cheese, garlic powder, and salt.
Place green beans on the lined pan, tightly grouped together but not laying on top of each other. Generously sprinkle seasoned Parmesan on top of green beans.
Bake:
Bake for 12-15 minutes, until the Parmesan has browned and the green beans are crispy.
Remove from oven and serve immediately.
Notes
You can use frozen green beans (about a 1lb bag). If so, thaw out green beans either on the counter or microwave and proceed with recipe.