Preheat an oven to 400° F
Line a square baking pan with aluminum foil
Topping
In a small bowl, add the olive oil and brown sugar. Combine
Add the garlic, pecans, thyme, pinch sea salt and a grind of black pepper
Fold in ½ cup Parmesan
Set aside
Hasselback Sweet Potatoes
Using a sharp knife, cut each sweet potato crosswise into ⅛" slices, cutting only three-fourths of the way through the potatoes, so they stay intact
Place the potatoes, sliced side up, in the prepared baking pan. Drizzle with olive oil and season generously with salt and pepper
Roast until the potatoes are browned on the outside and tender in the center, 50 to 60 minutes, sprinkle the topping over the potatoes during the last 10 minutes of roasting
Remove from the oven and sprinkle evenly with the remaining ½ cup cheese.
Let cool slightly before serving