Preheat oven to 350 and line a baking sheet with parchment paper. Set aside.
In a mixing bowl, add cake mix, oil, eggs and vanilla. Mix well. The dough will be very stiff and you may question if this recipe is missing something! It's not! Keep mixing, it takes a good minute or two to come together as a dough.
Once you have everything mixed, add in 1 cup candies and mix well.
Use a tablespoon portion scoop to scoop onto prepared pan and place 2" apart.
Press remaining candies into each cookies.
Bake for 9-11 minutes.
Let set to cool on baking sheet for 2 minutes before removing from pan to a cooling rack and allowing to cool completely.