Preheat oven to 300 degrees F. Have ready two ungreased baking sheets (or feel free to line with parchment).
Melt the butter and set it aside to cool.
Weigh the flour and stir together flour, baking soda and salt (and cinnamon,if using).Set aside.
Weigh out the brown sugar so that you get 210 grams. Add it to the mixing bowl along with the granulated sugar and the cool melted butter. Beat until well mixed, then beat in eggs and extract.
Add flour mixture to sugar mixture and stir until blended, then stir in oats, raisings and nuts (f using).
Scoop very large, golf ball sized rounds and arrange on trays, spacing 3 inches apart. You can leave them as balls or press down slightly so that the tops are flat.
Bake for about 20 minutes, until golden. A bit longer for crisper cookies.