Preheat your oven to 350 degrees (F), and line an 8-by-8-inch pan with parchment paper.
Add the dry ingredients (salt, baking soda, flour, and rolled oats) to a bowl, mix, and set aside.
Combine the vegetable oil (or butter), brown sugar, and white sugar in a large mixing bowl. Mix until smooth and airy.
Add the egg, mixing well; then add the vanilla. If you use oil, beat it until the mixture looks frothy. If you use butter, it will be denser (but still light).
Add the dry ingredients to the wet ingredients and stir until just combined. Mix in the chocolate chips.
Dump the cookie dough into the prepared pan and gently level it with your fingers or a spoon (don't press it down hard).
Bake for 25 to 30 minutes; the cookies should be golden brown on top.
Remove from oven and let the pan cool completely before cutting into bars.
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