Preheat the oven to 350°F. Cover a cookie sheet with parchment paper or a nonstick baking mat to help prevent the cookies from sticking and make cleanup easier.

Place the white cake mix, eggs, cooking oil, and vanilla extract in a large mixing bowl. Stir until the ingredients form a smooth, evenly blended dough.

Add ¼ cup of the sprinkles to the dough and gently stir until they are distributed throughout the mixture.

Portion the dough into tablespoon-sized amounts and roll each portion into a ball.

Spread the remaining ½ cup of sprinkles across a plate. Roll each dough ball through the sprinkles until its surface is evenly covered on all sides.

Set the coated dough balls on the prepared baking sheet, leaving approximately 2 inches of space between each cookie to accommodate spreading during baking.

Bake in batches if the baking sheet cannot hold all of the cookies while maintaining the required spacing.

Transfer the baking sheet to the preheated oven and bake for 8–10 minutes, or until the cookies are set and the edges have developed a light golden-brown color.

Allow the freshly baked cookies to remain on the baking sheet for several minutes after removing them from the oven.

Transfer the cookies to a wire cooling rack and leave them until completely cooled. Continue shaping, coating, and baking the remaining dough in the same manner.