Prepare all of the ingredients. Preheat oven to 400deg.
In a frying pan over medium high heat, add bacon. Cook until crispy but do not remove bacon or grease from pan.
Spread green beans over a large baking sheet. Sprinkle with onions and garlic. Then pour bacon and bacon grease over the top. Using tongs, toss the green beans around on the baking sheet to coat and combine. Place in oven and bake for 30 minutes.