Pre-heat oven to 425 and line a baking sheet with foil.
Place green beans in a resealable plastic bag and toss with olive oil, salt and pepper. Seal bag, shake well then spread green beans in a single layer on prepared baking sheet.
Roast green beans until tender and slightly blistered, about 15-20 minutes, stirring once half-way through.
While green beans are roasting, fry the bacon in a medium skillet until crispy. Drain on a plate lined with paper towel and set aside.
Spread roasted green beans on a large platter and sprinkle with crumbled, crispy bacon pieces. Serve with lemon wedges.