Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a medium bowl, whisk together flour, oats, cinnamon, baking soda, and salt.

In a large mixer bowl, cream together softened butter, brown sugar, and granulated sugar until light and fluffy.

Add egg and vanilla extract to the creamed mixture, and mix until smooth.

Gradually incorporate the dry mixture into the wet ingredients until just combined.

Fold in raisins gently to distribute them evenly.

Scoop mounds of dough onto the baking sheet, spacing them about 2 inches apart.

Bake for 10-12 minutes until edges are golden brown and centers look soft.

Cool cookies on the baking sheet for 5 minutes before transferring to a wire rack.

Serve warm with a glass of milk and enjoy!