Preheat over to 425 degrees.
Cover a large baking sheet with foil and lightly spray with non-stick spray (I used an olive oil one) and set aside.
In a medium pot, add 2-3" of water and some salt and bring to a boil.
While you're waiting for the water to boil (put a lid on the pot to speed it up), trim the ends off the green beans.
Once the water is boiling, add the green beans and boil for approximately 3 minutes.
Meanwhile, add ice and water to a large bowl to make an ice bath.
After 3 minutes, drain the green beans and add them to the ice bath. Let them cool down, then drain and pat the green beans dry.