Combine melted butter, garlic and brown sugar, mix well.
Pour the butter mixture over the green beans and toss well.
Place the beans on a rimmed baking sheet and roast for 10-15 minutes until crisp tender.
Don't overcrowd the pan. The air needs to circulate throughout the food for perfect roasting. You may need 2 sheet pans if you have the standard size.
Cook Uncovered- There is no need to cover your greens while they are roasting. The proximity of the heat to the veggie will actually caramelize them and lock in the sweet and savory taste.
These beans will be crisp-tender. If you like yours softer then cook them a few minutes longer. Just check after 2-3 minutes until you have the desired doneness. The longer the cooking time the softer the texture will be and they will turn more of an olive green/brown color. This is fine, they will still taste awesome!