This Mess Is Ours
The yams you see at your local grocery store across the entire United States, well they’re actually sweet potatoes!
To make roasted sweet potatoes in the oven you will need to gather a fork, foil, measuring cup, and a large, heavy ovenproof skillet. Place an oven rack in the bottom third of the oven and preheat to 400°F .
The reason you're poking holes all over is to simply allow some of the built-up steam to escape from the inside of the sweet potato as it cooks.
Nestle the prepped sweet potatoes on one half of the skillet. Add enough water to just cover the bottom of the pan.
This should take about 30-35 minutes.
Remove the foil, halve the sweet potatoes and place them on a baking sheet. Drain water from the skillet then return to the oven, EMPTY for 20 minutes. This intense heating of the pan will create a sear on the sweet potatoes.
Working quickly melt 2 tablespoons butter (I prefer salted) in the skillet.
Place the sweet potato halves cut side down into the melted butter.
Or until the the edges are browned and crisp like in the image below!