2cupsold-fashioned large flake oatsnot quick or instant
1 1/2cupsall purpose flour
6.5oz/200 grams good quality dark chocolatecoarsely chopped
Preheat oven to 375ºF. Beat butter with sugars in stand mixer until very light and fluffy, about 3 minutes. Beat in eggs, one at a time, then vanilla.
In a separate bowl, whisk together oats, flour, baking soda and salt. With mixer speed on low, gradually add to the butter mixture; beat until incorporated. Beat in toffee bits and chocolate.
Drop by tablespoonfuls 2" apart onto parchment-lined baking sheets. Bake for 6-8 minutes, until edges are golden and centres are still slightly underdone. Cool a few minutes on baking sheets before transferring to wire racks to cool completely.