In a medium bowl whisk together the flour, baking soda, salt, and cinnamon then set aside.
Combine butter and sugars in mixer and beat until light and fluffy.
Scrape the bowl down and add the vanilla and eggs one at a time.
Add flour mixture and mix on low until almost combined then add the oats and butterscotch morsels and mix on low until just combined.
Use a spatula to fold in any unmixed bits then portion out two-tablespoon sized pieces and place on parchment lined baking sheets allowing about 3 inches in between.
You can bake straight away but I prefer to freeze the rolled cookies for 10 minutes before baking at 375F for 10 minutes.
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Notes
After preparing the cooking I like to freeze them for 10 minutes before baking so they hold their shape and don't spread too much.
Make sure to use old-fashioned oats and no other type of oatmeal or you will not get the same results.
Although we are making a sweet cookie, salt is important for adding flavor so don't skip it.
Make sure to measure your flour correctly for accurate results. If you don’t have a kitchen scale fluff the flour and sprinkle it into your measuring cup before leveling.
You can refrigerate the cookie dough in a bowl for 2-3 days but make sure to let it sit a room temperature for around 20 minutes so it's easier to measure out into cookies.
I recommend using unsalted butter because we add salt to this recipe. If you only have salted butter don't worry just reduce the amount of extra salt you add.
If you're not a fan of butterscotch you can swap them for chocolate chips.
Let the cookies rest for 5-10 minutes before moving to a cooling rack to cool completely.