Preheat oven to 450˚ F.
Add potatoes to a pot and cover with cold water. Bring to a boil and cook until fork tender, about 15-20 minutes.
Drain potatoes and add to a parchment lined or lightly oiled baking sheet. Smash each potato with the back of a fork or a potato masher, making sure potatoes remain in one piece. Then drizzle or brush potatoes with olive oil and season with salt and pepper.
Roast in the oven until crisp and golden brown, about 15 - 20 minutes.
Meanwhile mix yogurt with some salt and pepper and any optional ingredients you might have on hand.
Top each potato with yogurt sauce and serve immediately.