Preheat the oven to 350 degrees F.

Rinse the peanuts under cool water to remove excess dirt. Pat dry and place in a large bowl and toss with the peanut oil and salt until well coated.

Place on 2 half sheet pans, making sure to spread them out into a single layer. Roast in the oven for 30 to 35 minutes, rotating the pans halfway through cooking (front to back and swapping shelves). Once you remove the peanuts from the oven, let them cool slightly before eating. They will continue to "cook" and become crunchy as they cool.