Add potatoes to a medium-sized pot. Add water to the pot just until the potatoes are covered completely.
Bring to a boil, then mix in 2 tbsp salt. Continue to boil just until a fork inserts easily into the potatoes, about 15-20, depending on the size of your potatoes. Be careful not to overcook--otherwise, they'll fall apart when you smash them.
Drain potatoes and let sit for 5 minutes.
Preheat oven to 425F. Lightly coat a baking sheet with cooking spray.
Place cooled potatoes on baking sheet and, using the bottom of a cup, smash each potato until slightly flattened (see pic above).
Melt light butter and garlic together. Brush the tops of the potatoes with the butter, making sure that you DON'T include the garlic pieces. Those will burn in the oven; we just want to garlic to flavor the butter.
Bake for 35-45 minutes, or until the tops are golden brown and crispy.
Finish with cracked pepper, a little little sprinkle of salt, and chopped parsley or chives.