Step 1

Whisk together the flour, baking soda, cornstarch, and salt until well combined. Set aside.

Step 2

In a large bowl, beat together the butter and brown sugar until light and fluffy.

Step 3

Add the egg and vanilla extract and beat to combine.

Step 4

Add the dry ingredients and mix until well combined. NOTE: the dough will be thick.

Step 5

Fold in the mini chocolate chips and toffee bits.

Step 6

Use a tablespoon or 1 tablespoon cookie scoop to scoop out balls of dough. Roll the balls between your hands to smooth them, then place the balls on a plate or baking sheet and chill for at least 2 hours.

Step 7

When ready to bake, preheat the oven to 350 degrees. Line a baking sheet with parchment paper and place the dough balls two inches apart on the prepared pan.

Step 8

Bake in the preheated oven for 10 to 12 minutes, until the edges are just beginning to brown.

Step 9

Allow the cookies to cool for 5 minutes on the pan, then transfer to a wire cooling rack to cool completely.