Preheat oven to 375 degrees. Line a 9 inch baking dish with foil, parchment paper, or spray well with non-stick spray. Set aside.
Mix together Country Crock, sugar, brown sugar, egg, egg yolk, and vanilla extract until well combined. Add flour, baking powder, salt, and baking soda. Mix until smooth and creamy. Stir in chocolate chunks.
In a large bowl melt caramels and evaporated milk together - place in microwave on 30 second intervals, stirring in between.
Press 1/2 of the cookie dough into a 9 inch baking pan. Pour melted caramel and spread evenly over the dough. Drop balls of remaining dough over the top.
Bake for 34-45 minutes, until golden and cooked through. Top with foil for last 15 minutes, if browning too quickly.
Remove from oven and let sit on baking sheet for 5 minutes before removing to a wire rack to cool completely.
Slice into squares to serve