Heat olive oil in a large skillet over medium-heat. Add garlic and cook for 1 minute.
Add water, tomato sauce, and green beans. Stir.
Place a lid or baking sheet over the skillet and cook for 9 minutes (al dente) or until the green beans have reached your desired texture.
Top with shaved or grated Parmesan.
Notes
If you prefer green beans that are softer, increase the water by 2 tbsp and cook until they have reached your desired texture. Check after the initial 9 minutes to see if additional water needs to be added.You can use frozen green beans.