Preheat oven to 350 degrees Fahrenheit.

Peel and cut the potatoes into wedges. Place into a bowl. Add oil and toss to coat. Spread onto a lined baking sheet and sprinkle with a bit of kosher salt. Bake, covered for one and a half hours, then uncover for approximately 15–20 minutes.

Cool and place into a mixing bowl. Add sweet chilli sauce and heavy cream. Mix well and lay into an oven safe serving dish. Cover with foil and bake for 30 minutes.

Raise oven temp to 400 degrees Fahrenheit.

Sprinkle the cheddar/mozzarella blend all over the top and bake again uncovered for 10 minutes, or until cheese is just beginning to brown. (Optional: Sprinkle some shredded Parmesan cheese when it comes out, and serve.)