Step 1

Heat oven to 325 degrees F (165 degrees C). Line cookie sheet with parchment paper or a silpat liner.

Step 2

In a medium sized bowl, cream together the melted butter, brown sugar, and granulated sugar until well blended.

Step 3

Beat in the egg yolk and the vanilla extract until creamy. Set the bowl aside.

Step 4

In a separate small bowl, mix together the flour, baking soda, cinnamon, and salt.

Step 5

Mix the flour mixture into the butter mixture until well blended. Stir in the oats and raisins.

Step 6

Use a medium sized cookie scoop and place cookies 2-inches apart on the cookie sheet.

Step 7

Bake for 8 to 10 minutes. Do not overbake.

Step 8

Let the cookies cool for 5 minutes on a cookie sheet then transfer them to a cooling rack to finish cooling.