01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, salt, and cinnamon until evenly blended.
03 - In a large bowl, beat butter, granulated sugar, and brown sugar until light and fluffy, approximately 2-3 minutes.
04 - Beat in eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in vanilla extract.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing until just combined. Avoid overmixing.
06 - Gently fold in oats, drained pineapple tidbits, and raisins until evenly distributed throughout the dough.
07 - Drop tablespoonfuls of dough onto prepared baking sheets, spacing 2 inches apart to allow for spreading.
08 - Bake for 12-14 minutes, or until edges are lightly golden while centers remain slightly soft.
09 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool completely.