In a mixer bowl, combine the butter, both sugars, milk, egg, vanilla, cinnamon, salt, and baking soda. Mix well until fully combined.

Gradually add the flour, oats, and raisins, mixing until just incorporated.

Line a baking sheet with parchment paper. Drop tablespoon-sized portions of dough onto the sheet, leaving space between each cookie as they will spread. Bake at 350°F (175°C) for 12–15 minutes, depending on your oven and how crisp you like your cookies.

Enjoy!