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Preheat oven to 350°F Coat 2 baking sheets with cooking spray.
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Grind oats in a blender or food processor. Transfer to a medium bowl and stir in flour, baking soda and salt. Beat butter in a large bowl with an electric mixer until fluffy. Add oil, granulated sugar, brown sugar, egg and vanilla; beat until smooth and creamy. With the mixer running, add the dry ingredients, beating on low speed until just combined. Stir in chocolate chips.
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Drop the dough by heaping teaspoonfuls, at least 1 inch apart, onto the prepared baking sheets. Bake cookies, 1 sheet at a time, until firm around the edges and golden on top, about 15 minutes. Cool the cookies for 2 minutes on the baking sheets, then transfer to wire racks to cool completely.