Preheat the oven to 350 degrees.
Line an 8x8in pan with a sheet of parchment paper
In a medium sized bowl, cream together your butter and brown sugar. Beat for 2 minutes till light in color.
Add in egg and vanilla extract and stir until combined.
Pour in the salt, cinnamon, and flour and stir to combine.
Fold in the apple pieces.
Scoop half of the batter into the prepared pan and flatten.
Add the caramels and milk to a small sauce pan over medium heat. Heat until caramels are fully melted and creamy.
Pour melted caramel over the dough.
Drop remaining dough over the caramel evenly.
Bake in preheated oven for about 30 minutes, until a toothpick comes out clean.
Sprinkle with sea salt and allow to cool before slicing and serving.
Serve warm with ice cream and extra caramel syrup if desired.