If you're making your own salted caramel sauce - do it prior to starting the recipe (here). It can also be made up to one week in advance and kept in the fridge until needed!
Preheat the oven to 350°F / 175°C. Grease and line an 8" pan with butter and parchment paper.
Add the butter to a microwave safe medium sized mixing bowl, then melt it in the microwave.
To the melted butter, whisk in both sugars, followed by the egg and vanilla.
Add in the flour, oats, baking soda, baking powder, and salt. Gently mix the ingredients together until just a few flour streaks remain. Then, mix in the chopped pecans just until no flour streaks remain.
Spread ~¾ of the batter into the bottom of the prepared pan, and smooth it down into an even layer. Bake for 15-20 minutes, until the edges turn golden brown.
Remove the dough from the oven. Sprinkle the chocolate chips into an even layer over the dough, then top with the salted caramel sauce.
Tear the remaining dough into little chunks and place it on top of the salted caramel layer. It will not fully cover the layer - this is completely fine!
Bake for an additional 20 minutes, until the dough on top turns golden brown.
Let the pan cool at room temperature, then place the bars in the fridge for at least 2 hours before slicing. Serve and enjoy!