Preheat your oven to 350F and line 3 large cookie sheets with parchment paper.
Spread the oat on one of the pans and bake for 5 minutes. Remove from oven and set aside to cool.
Using a food processor, process 4 TBS of the baked oat into a fine powder.
In a bowl of a standing mixer, or using a hand mixer and a large bowl, beat butter and sugars until fluffy and light in color about 4-5 minutes. Stop the mixer halfway and scrape the sides and bottom of the bowl.
Mix in the egg and vanilla extract.
In a large bowl, mix the flour, baking soda, salts, oats, and powdered oats use a fork to fully blend then add the butterscotch and toss to make sure all have been coated with flour.
With the mixer on low, add the flour mixture to the butter mix. Do not over mix, and finish mixing using a rubber spatula.
Using a cookies spoon (1 1/2 TBS size) scoop the cookie batter and place 4 cookies on a cookie sheet, leaving 2-3" space between each cookie.
Reduce oven temperature to 340F (160C).
Place pan in the middle oven rack and bake for 8 minutes. Remove from the and use a large cookie cutter to gently twirl the cookie and make it round.
Place the pan back in the oven and bake for another 4-6 minutes.
Remove from the oven and twirl the cookies again with the cookie cutter. Allow cookies to cool before removing removing from the pan or serving.If you want the cookies to spread more, reduce the oven's temperature to 320°F. Repeat with the remaining of the dough.