01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Toast sliced almonds in a dry skillet over medium heat until golden and fragrant, about 3–4 minutes, stirring frequently. Set aside to cool.
03 - In a medium bowl, whisk together oats, flour, baking soda, cinnamon, and salt until well blended.
04 - In a large bowl, beat softened butter, brown sugar, and granulated sugar until light and fluffy.
05 - Beat in the egg and vanilla extract until fully incorporated.
06 - Gradually mix the dry ingredients into the wet ingredients until just combined. Do not overmix.
07 - Gently fold in toasted almonds and raisins until evenly distributed throughout the dough.
08 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing them 2 inches apart to allow for spreading.
09 - Bake for 10–12 minutes, or until edges are golden brown but centers remain slightly soft.
10 - Let cookies rest on baking sheet for 2 minutes, then transfer to a wire rack to cool completely.