Preheat oven to 350 degrees F.

Line an 8x8 inch baking pan with foil and coat with butter or cooking spray.

In a medium bowl combine melted butter, brown sugar, rolled oats, flour, baking soda and vanilla.

Spread 1/2 of the oat mixture in the bottom of the prepared pan.

Bake for 10 minutes.

While that is baking melt caramels with salt and milk in a medium saucepan over medium heat stirring very frequently.

Remove crust from oven and sprinkle with chocolate chips and top with caramel.

Carefully top the caramel with the remaining oat mixture.

Bake for 15 minutes.

Cool completely before cutting into bars. I froze the bars after they were cooled to help them cut and come out of the pan easier.

Store in the refrigerator.