From America’s Test Kitchen:
https://m.youtube.com/watch?v=Al4LYwOKsxw&t=435s&pp=2AGzA5ACAQ%3D%3D
Spray baking sheet with baking spray
Add 3 Tblspns veg oil to sheet, spread via tipping Cut 2 lbs Yukon Golds into rectangular planks
3 Tblspns cornstarch in 3/4 cup water
Microwave for 2 minutes, stir every 20 seconds
Toss potato planks in the slurry
Spread onto sheet with a bit of space between
Cover with greased alum foil
425˚ oven for twelve minutes, bottom rack
Remove foil, bake for 10-18 minutes
Turn planks, bake for 10-18 minutes
Season with 1/2 Tblspn salt immediately
Move to paper towels Serve
