I learned how to make this from my grandma. I don't measure anything out. I just put it on the pan. Depends on how much you want.
Heat oven to 425 degrees.
Spray cookie sheet with Pam.
Clean & Cut RED potatoes, place on cookie sheet.
Spray potatoes with Pam.
Sprinkle potatoes with Garlic Salt.
Put a few tablespoons of butter on top of the potatoes.
Cook at least 30 to 45 minutes, or until done. (depends on how soft or crunchy you like them.)