Preheat your oven to 350°F (175°C)
In a large mixing bowl, pour in the cake mix, vegetable oil, plant-based milk, and vanilla extract if you’re using it. Stir everything together until you have a thick, doughy consistency. It will be thick, but that will result in fluffy cookies in the end.
Scoop about one tablespoon of dough at a time and roll it into a ball. For uniform cookies, you can use a cookie scoop.
Fold in the vegan sprinkles or dairy-free white chocolate chips if desired. OR roll cookie dough into balls and roll balls in sprinkles. I liked rolling mine in the sugary sprinkles.
Bake for 9-11 minutes, or until the edges look set and oh-so-slightly golden brown. Vegan cake mix cookies continue to firm up as they cool, so it’s best to remove them when they look just a bit underdone.
Allow your cookies to cool on the cookie sheet for about 5 minutes before moving them to a wire rack to finish cooling.
Store your cookies in an air-tight container for up to 5 days.