Preheat oven to 350 degrees.
In a medium-sized mixing bowl, add melted butter, brown sugar, and vanilla. Whisk vigorously until well combined.
Add in flour, oats, salt, and baking soda and stir with a spatula until the dough comes together.
Coat the bottom of a 9x13 glass baking dish with butter. Take half of the dough and spread it with your hands or a spatula evenly across the bottom of the baking dish.
Place into oven and bake for 10 minutes.
1-2 minutes before taking out the bottom layer, warm your dulce de leche in a microwave safe dish until it pours easily.
Remove baking dish with par-baked bottom layer and sprinkle chocolate chips carefully over the top. Drizzle the warm caramel on top of that.
Finish by crumbling the second half of the dough over the top in an even layer.
Place back in the oven and bake for 15-20 minutes, until it is cooked through.
Allow to cool for 1-2 hours so that the bars can solidify before cutting.