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Gather ingredients:
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Mix cookie dough: Preheat oven to 350°F. Whisk together oil, salt, and eggs in a medium bowl until well combined, about 1 minute. Add cake mix, stirring until fully combined, about 2 minutes.
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Fold in white chocolate chips. Refrigerate for 20 minutes.
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Scoop cookie dough: Line 2 rimmed baking sheets with parchment paper. Portion out 24 heaping tablespoons of dough and roll them in your hands to form round balls. Place each ball about 2 inches apart on the baking sheet (Cookies will spread out considerably, so it's important to leave plenty of space).
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Bake cookies: Bake in preheated oven just until edges begin to brown slightly, 10 to 12 minutes. Let cookies cool on baking sheets for 10 minutes.
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Transfer to a wire rack to cool completely, about 10 minutes.