An easy and delicious one pan side dish.
Cut the stems from the green beans. Slice mushrooms. Place green beans and mushrooms on a baking sheet.
Drizzle with olive oil and sprinkle with kosher salt and pepper. Toss until evenly coated.
Place the baking sheet in a 400 degree oven. Roast for 20 minutes.
Serve immediately. Sprinkle with crushed red pepper flake and/or parmesan cheese if desired.