Preheat oven to 350 degrees.
Line a baking sheet with parchment paper (this will keep the cookies from spreading into each other).
In a large mixing bowl, add the cake mix, eggs, baking powder, vegetable oil and vanilla.
On medium speed, mix with an electric mixer until all of the ingredients are well incorporated. The batter will be thick.
Fold in the milk chocolate chips.
Using a tablespoon or cookie scoop, drop 1 inch balls onto the parchment lined baking sheet.
Bake at 350 degrees for 10 minutes exactly. Do not overbake.
Once removed from the oven, keep cookies on the baking sheet for 5 minutes to cool. Sprinkle Valentine sprinkles on top of the cookies.
Transfer to a wire rack to cool completely.
Place a chocolate heart on top of each cookie before it completely cools.
ENJOY!