Preheat oven to 375 degrees. Line a cookie sheet with parchment paper and set it at the side. In a medium-sized bowl combine the oil and the eggs. Stir in the cake mix. Fold in optional mix-ins if using.: The kitchen fills with a warm, anticipatory scent as the oven reaches 375 degrees , which helps the cookies set quickly on the edges while staying soft inside. Proper oven temperature ensures the top dries enough so the cookies do not flatten too much. A common error is not preheating long enough, leading to uneven baking, so wait until the oven indicates readiness and position your rack in the center of the oven.
Using a small cookie scoop drop the cookies on the sheet spacing 2 inches apart. Bake for 7-10 minutes or until set. Remove from the oven and let cool on a rack.: The faint crinkle of parchment signals easy cleanup, and it prevents sticking, so baked bottoms remain intact and lightly browned. Lining the sheet also offers a visual boundary when spacing cookies. Using unlined metal can cause extra browning or sticking, so avoid that when possible; if you must, lightly grease the sheet.
If using the melted white chocolate, dip each half of the cookie and top with sprinkles.: When you whisk vegetable oil and eggs , the mixture becomes glossy, and you can hear a soft, watery swirl as they come together. This emulsified base helps the dry mix hydrate evenly, preventing streaky pockets of flour. Over vigorous whisking can incorporate too much air, giving a drier crumb, so stir until smooth and homogenous.
Stir in the cake mix: As you add the Strawberry Cake Mix the batter thickens and the aroma of strawberry becomes more pronounced, a sweet, almost jam like scent. Stir gently until no dry streaks remain, and the texture resembles a soft cookie dough rather than a loose batter. If you overmix, the texture may become gummy, so fold until just combined.
Fold in optional mix-ins if using: Folding in m&ms or other mix ins should be done with slow, deliberate turns so the colors stay intact and the chips do not bleed. You will see little pops of color distributed through the dough, which is visually satisfying. A mistake here is stirring too vigorously and crushing the candy, which can color the dough and make it messy.
Using a small cookie scoop drop the cookies on the sheet spacing 2 inches apart: Scooping with a small cookie scoop creates uniform rounds that bake evenly; spacing them about 2 inches apart prevents them from fusing together as they spread. The dough feels slightly tacky but holds shape. If cookies spread too much, chill the scoops briefly before baking to keep them thicker.
Bake for 7 to 10 minutes or until set: While baking you will notice the kitchen fill with a warm, sweet strawberry perfume and the tops becoming matte instead of glossy, which indicates they are set. Edges may show a hint of gentle browning while centers remain soft. Pulling them out too early causes collapse, and leaving them too long results in dry, crisp cookies, so watch the 7 to 10 minute window and trust the visual cue of a set top.
Remove from the oven and let cool on a rack: The cookies continue to firm as they cool, and moving them to a wire rack prevents steam from making the bottoms soggy. You will notice a slight give when they are warm and a firmer bite once cooled. Trying to transfer piping hot cookies can cause them to break, so let them rest a few minutes on the sheet before lifting to the rack.
If using the melted white chocolate, dip each half of the cookie and top with sprinkles: Melting the white chocolate chips until smooth yields a glossy coating that clings to the cookie edges, and the sprinkle scatter adds a festive crunch. Work over parchment to catch drips, and press sprinkles in while the chocolate is still tacky for a secure finish. Avoid overheating the chocolate because it can seize and become grainy, making dipping messy and uneven.