Preheat oven to 425 degrees.
Prick sweet potatoes with a fork several times, this will help speed up the cooking process.
Put the sweet potatoes on a lined baking sheet, and bake for ~40 minutes or until ALMOST tender.
To make the yogurt base, mix yogurt, lemon juice, and salt and pepper until it tastes very tangy and salty.
Once potatoes are done, split the top open slightly using a knife. On a cutting board, use the palm of your hand to smash them down a bit.
Add butter to a medium pan and heat over medium heat. Once melted, add smashed sweet potatoes and drizzle maple syrup on top. Season with salt and pepper.
Cook potatoes for 5 minutes and then flip them so the maple syrup side has contact with the heat for 5 more minutes.
To serve, spread yogurt on a serving dish or plate. Place cooked potatoes on top and top with leaves of fresh thyme. Top with more maple syrup if you prefer.