Preheat oven to 350 F. Line two large cookie sheets with parchment paper. Set aside. Place the butter and brown sugar in a large bowl. Beat together with an electric hand mixer until light and fluffy; about 2-3 minutes.
Add the eggs and vanilla; mix until combined.
Add baking soda, salt and flour. Mix until just combined. Add oatmeal and continue mixing until combined. Fold in the chocolate chips and toffee bits.
Using a large cookie scoop, drop onto the prepared cookie sheets. Bake for 10 minutes (cookies may still look slightly underbaked). Do not over bake! Remove from oven and let set on cookie sheets for about 3 minutes before transferring to a cooling rack. Enjoy!