Preheat the oven to 350°F / 175°C. Grease and line an 8" square 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.
Add in the flour, oats, coffee grounds, baking soda, baking powder and salt. Fold the mixture together with a rubber spatula just until no flour streaks remain.
Spread ~¾ of the cookie dough into the bottom of the prepared 8" square 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 them with the salted coffee caramel sauce.
Tear the remaining dough into little chunks and place them scattered on top of the caramel layer. It will not fully cover the layer - this is completely fine!
Bake the bars for an additional 20-25 minutes, until the dough on top of the bars turns golden brown.
Let the pan cool at room temperature, then place the bars into the fridge for at least 2 hours before slicing. Serve and enjoy!