Preheat the oven to 350°F. Lightly grease (or line with parchment) two baking sheets.
1) In a large mixing bowl, beat together the butter, shortening, sugars, vanilla, salt, and vinegar.
2) Beat in the egg, then the baking soda, flour, and oats. Stir in the chips.
3) Drop the dough, by tablespoonfuls, onto the prepared baking sheets.
4) Bake the cookies for 12 to 14 minutes, until they're golden brown. Remove the cookies from the oven, and cool on a rack, or right on the pan. Lighter-colored cookies will be chewier; darker-colored, crunchier.