Step 1: Preheat the Oven: Preheat the oven to 350F (175C). Line a baking sheet with parchment paper to prevent sticking.
Step 2: Combine Ingredients: In a large bowl, combine the Duncan Hines cake mix, vegetable oil, and eggs. Mix until well combined. The batter will be thick.
Step 3: Add Mix-Ins (Optional): If desired, gently fold in chocolate chips, sprinkles, nuts, or any other mix-ins.
Step 4: Drop by Spoonfuls: Drop rounded tablespoons of cookie dough onto the prepared baking sheet, leaving about 2 inches between each cookie.
Step 5: Bake: Bake for 10-12 minutes, or until the edges are lightly golden and the centers are set.
Step 6: Cool: Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
Optional Tip: For softer cookies, slightly underbake them. For a different texture, substitute melted butter for vegetable oil. Use different extracts to enhance the flavor profile, such as vanilla, almond, or lemon extract.