Preheat oven to 350℉ **(see note)
Line two baking sheets with parchment paper. Set aside.
Combine flour, baking soda, and salt. Set aside.
Cream together butter and both sugars.
Add eggs, one at a time, to the butter and sugar and mix until just combined.
Add vanilla to the wet ingredients and mix until just combined.
Add dry ingredients to wet. In 3 batches or all at once if using a large stand mixer.
If using a stand mixer, remove the bowl and add the chocolate chips and toffee bits. Mix with a wooden spoon or sturdy spatula.
Refrigerate dough for 30 minutes or until chilled but still soft enough to scoop. Then preheat oven to 350℉ when you're ready to scoop dough.***
Spray a 1 oz cookie scoop with cooking spray and scoop dough onto trays, evenly spaced and 8 per tray.
Bake for 16 minutes until edges of the bottom of the cookies are just starting to brown. Rotate and swap trays halfway through bake time.
Let cool completely on trays on cooling racks.