I was going to make these each little individual smashed potatoes but decided I didn't care if they all broke up into one big pile. The idea was to oven roast them with herbs and olive oil after par-boiling them. Just even to crisp up the skins and get the flavor of the herbs cooked inside them. Cooking them this way allows you to serve them family style. Everyone just helps themselves to a big scoop right off the hot pan. They are delicious and so easy to make. You could throw them on the grill if you wanted to skip turning on your oven.
Wash potatoes and put them into a stock pot big enough to boil them in. Cover potatoes with water. Salt water with a significant amount of salt. (this salt can be iodized or kosher salt)
Bring water to a boil and boil potatoes until barely fork tender. About 15-20 minutes. While potatoes boil, chop your chives and rosemary.
Remove from heat and drain. Preheat oven to 450°. Move oven rack to second from the top.
While oven is preheating, cool potatoes slightly. Next, drizzle enough olive oil on a pan to allow the bottom part of the potatoes to sit in it.
Place the potatoes on the pan then take a potato masher and break them open. At this point you can decide to keep them as individual potatoes or mash them up a little more like I did. Some you may not have control of depending on how much they have cooked.
Melt your 3 T. of butter in the microwave then add the 1/4 cup olive oil to it. Stir it to mix well. Use a brush and coat the potatoes and skins well with mixture. If you run out, just mix some more. Make sure you get the meat of the potatoes and skins covered with the butter/oil as this helps it crisp up in the oven.
Salt, pepper and garlic salt the potatoes at this point very well. Sprinkle with the herbs.
Bake at 450° for 20-25 minutes. You want the skins to be crispy. Remove from oven and serve.
Top with sour cream and extra chives if desired. Enjoy!