Preheat the oven to 450 and line a baking sheet with parchment paper.
Wash and quarter the fennel bulbs. Spread the fennel onto the baking sheet and coat them in 1 tablespoon of olive oil. Place the cloves of garlic on the tray, season with salt and pepper and roast for 15 minutes
Remove the tray from the oven and flip the fennel. Add the white beans to the tray and return the tray to the oven and roast for another 5 minutes or until the fennel starts to brown. Remove from the oven and set aside.
Meanwhile in a small bowl whisk together the remaining 2 tablespoons olive oil, lemon juice and parsley with a pinch of salt and pepper. Pour the mixture over the fennel and white beans, toss and serve warm.