Preheat oven to 400°F (200°C).
In a large bowl, combine green beans, potatoes, olive oil, and ranch seasoning. Toss to coat evenly.
Spread the mixture onto a baking sheet in a single layer.
Top with chopped bacon.
Bake for 25-30 minutes, or until potatoes are tender and bacon is crispy.
Season with salt and pepper to taste before serving.