In a large bowl, whisk cornstarch, baking soda, and salt together. Set aside.
In another large bowl, (or stand up mixer) cream together butter and sugars until smooth and creamy, about 3 minutes.
Add egg and vanilla, beat until combined. Slowly mix in dry ingredients.
Stir in 1½ cups of various chopped candies.
Using medium cookie scoop, place cookie balls (tablespoon size) onto baking sheet lined with parchment paper, about 2 inches apart.
You can top cookie balls with additional candy pieces and/or see various tip later on.
Chill dough in refrigerator until you are ready to bake to keep dough chilled.
Bake cookies 9-10 minutes, or until slightly golden brown around edges.
When cookies immediately come out, you can also add additional chocolates on top. This is when I do the Reese's, Hershey's Milk Chocolate bar pieces, or even Hershey Kisses.
Let sit on baking sheet for 4-5 minutes.
Transfer to wire rack for cooling and cool completely.
ENJOY!
Recipe by Sweet Dash of Sass at https://sweetdashofsass.com/2019/11/halloween-bucket-cookies/