Preheat oven to 350°F (175°C) and line three baking sheets with parchment paper.
Place the oats in a dry skillet over medium heat and toast for about 5 minutes, stirring frequently, until lightly golden and fragrant.
Spread the toasted oats onto a baking sheet and allow them to cool completely.
In a medium bowl, whisk together the flour, salt, baking soda, and cinnamon.
In a large bowl, beat the softened butter, brown sugar, and granulated sugar with an electric mixer for about 2 minutes until light and fluffy.
Mix in the vanilla extract, then add the eggs one at a time, beating well after each addition.
Gradually add the flour mixture to the butter mixture and mix on low speed until just combined.
Fold in the cooled toasted oats and raisins until evenly distributed throughout the dough.
Scoop the dough using a 2-tablespoon cookie scoop and place portions onto prepared baking sheets about 2 inches apart.
Bake two sheets at a time for 13–15 minutes, rotating the pans halfway through baking, until the edges are golden and the centers appear set.
Allow cookies to rest on the baking sheets for 2 minutes before transferring them to a wire rack to cool completely.