Place whole potatoes in a large pot of boiling water and boil for 20 minutes or until tender. Preheat oven to 400 degrees.
Grease a baking sheet with non-stick cooking spray. Place the potatoes on top of the baking sheet and gently smash with a fork or a potato masher. Be careful and not allow the potatoes to come apart, you will want to keep them together, just smashed. Bake for 20 minutes.
Whisk together the garlic and melted butter, pour over top of the potatoes and season with salt and pepper. Bake for another 5-7 minutes.