Heat oven to 350º. Line a baking sheet with parchment or a nonstick mat and set aside. Whisk together flour, baking soda and salt in a medium bowl. Set aside.

In the bowl of stand mixer fitted with a paddle attachment, beat butter and sugars together on medium speed until smooth. Add eggs, one at a time, beating well after each addition. Add the vanilla and mix well. Scrape down the sides and bottom of the bowl as needed.

Gradually add dry ingredients to wet ingredients, mixing on low speed until just combined. Using a rubber spatula, stir in toffee pieces and chocolate chips. Using a cookie scoop, place dough onto prepared pan, spacing about an inch or so apart.

Bake for 12-14 minutes, or until edges are golden brown. Allow to cool on baking sheet for 5 minutes, then cool completely on a wire rack.