Pre heat your oven to 375.
Line a cookie sheet with parchment paper. Set aside.
In a large bowl, add in the flour, salt, baking soda, and cinnamon. Whisk and set aside.
In another bowl, add in the butter, brown sugar, and granulated sugar and cream together.
Now add in the eggs and mix. Stir in the vanilla.
Sift the dry ingredients over the wet. mix.
Add in oats.
Fold in the raisins or chocolate chips.
Add to cookie sheets. 1 Tbsp per cookie. Spaced 2 inches apart.
Roll into a ball and press down only slightly, or cookies will end up flat.
Bake for 12-14 minutes, then leave in the pan for at least 1 minute before transferring them to a cooling rack.