01 -
Preheat oven to 350°F and lightly coat a 9 x 13 inch baking pan with nonstick cooking spray.
02 -
In a medium bowl, whisk together all-purpose flour, baking soda, salt, and ground cinnamon until thoroughly blended.
03 -
In a large bowl, beat unsalted butter, brown sugar, and granulated sugar together until the mixture is light and fluffy.
04 -
Add eggs one at a time, beating well after each addition, then mix in vanilla extract.
05 -
Gradually add the flour mixture to the wet ingredients, mixing until just combined.
06 -
Fold in oats and milk chocolate chips until evenly incorporated.
07 -
Spread batter evenly in prepared pan and bake for 30 to 45 minutes, or until golden brown and set in the center.
08 -
Allow bars to cool in the pan before slicing into portions for serving.