01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the flour, rolled oats, baking soda, salt, and ground cinnamon until evenly blended. Set aside.
03 - In a large bowl, beat the softened butter with packed light brown sugar and granulated sugar using an electric mixer until light and creamy, approximately 2 minutes.
04 - Add the eggs one at a time, beating well after each addition until fully incorporated. Mix in the vanilla bean paste until smooth.
05 - Gradually add the dry ingredient mixture to the wet mixture, mixing on low speed just until combined. Avoid overmixing.
06 - Gently fold in the diced apple, raisins, and chopped nuts (if using) with a spatula until evenly distributed throughout the dough.
07 - Drop heaping tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart to allow for spreading.
08 - Bake for 11 to 13 minutes, or until the edges are golden brown and the centers appear just set. Do not overbake.
09 - Allow the cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.