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Preheat oven to 375 (rack on the 2nd position from top).
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Slice "cold" unsalted butter into small pieces and whip in your mixer for a minute or so. Because it's cold it will stick a bit, but don't fret -- scrape and mix.
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Add both sugars, baking powder, baking soda and the cinnamon. With mixer combine at medium speed until the mixture has a crumbly texture.
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Add the eggs and vanilla and mix again until combined.
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With mixer on low speed, slowly add flour. If your mixer sounds like it's over-working, you may have to continue by hand and use a spoon.
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DON'T OVER MIX or cookies will get tough!
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Gently fold in the oats, and optional add-ins of chocolate chips or raisins.
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Chill the dough for at least an hour.
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Drop dough by the heaping tablespoon onto cookie sheet.
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"Lightly" sprinkle cookies with Kosher salt.
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Bake on 2nd rack from top at 375 for 12-15 minutes. (Cookies should still be soft to the touch).
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Carefully transfer them to a cooling rack and enjoy!