In a large bowl, cream together the butter, oil, and sugars together with an electric mixer. Beat until light and fluffy, about 2 minutes.
Add vanilla extract and eggs. Mix until combined.
Add flour, baking powder, baking soda, and salt. Mix until cookie dough has formed, scraping down the sides of the bowl as needed.
Add 2 cups of the candy and mix by hand until combined. Large cookie scoop to form into balls. Place on baking sheet, two inches apart. Use the remaining 1//2 cup of candy to the tops of the cookie dough balls.
Bake cookies for 7-10 minutes or until the edges are a light golden brown. Let cool on the baking sheet for a few minutes before transferring to a cooling rack. Makes 28 cookies.