Preheat oven to 450 Fahrenheit. Lightly spray a small roasting pan with cooking spray.

Place beans in pan and drizzle with olive oil, toss to coat. Sprinkle with sage and garlic powder, toss to coat. Cook for 35 to 40 minutes, shaking the pan after 15 minutes, until crispy throughout. Eat warm or cool. Store uneaten beans in an airtight container.