Preheat the oven to 350°F (175°C).
In a large bowl, cream together the softened butter and powdered sugar until smooth and light in color.
Add the vanilla extract and mix until combined.
In a separate bowl, whisk together the flour and salt.
Gradually add the flour mixture to the butter mixture, mixing until just combined.
Gently fold in the chocolate chips and toffee bits with a spatula until evenly distributed.
Turn the dough out onto a lightly floured surface and shape it into a log or rectangle.
Wrap the shaped dough in plastic wrap and refrigerate for at least 30 minutes.
Slice the chilled dough into even pieces and place them on a baking sheet lined with parchment paper.
Bake in the preheated oven for 12-15 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.
