Preheat the oven to 350℉. Line two cookie sheets with parchment paper (recommended), or spray with cooking spray or use a baking mat.
In a mixing bowl, or the bowl of a stand mixer, add the white cake mix, eggs, and melted butter. Beat on medium speed until a smooth dough forms.
1 box (15.25 oz) white cake mix, 2 large eggs, 1/3 cup salted butter
Allow the cookie dough to sit, at room temperature, for 5 minutes.
Pour the sprinkles into a shallow bowl or plate.
3/4 cup rainbow sprinkles
Use a medium cookie scoop, about 1½ tablespoons, and scoop out the cookie dough and roll into a ball. Roll the cookie dough ball well in the sprinkles making sure that all sides are coated well. Place 12 cookie dough balls per cookie sheet. Bake for 7-11 minutes or until the edges are set and are light golden brown.
Remove the cookie sheet from the oven when done and allow the cookies to cool on it for 5 minutes.
Press an unwrapped Birthday Cake Hershey Kisses into the center of each cookie. Remove the cookies to a cooling rack to cool completely.
18-20 Birthday Cake Hershey's Kisses