Place a large skillet over medium heat and let the pan preheat.

Cook bacon (in 2 batches) until crispy and set aside, leaving the bacon grease in the pan.

Add onions to the pan and cook for 10 minutes, stirring occasionally.

Add in balsamic vinegar, maple syrup and chicken stock then reduce heat to low and cook for another 30-35 minutes, stirring occasionally. 

Season with salt and pepper and add bacon back, cook for another 10 minutes until super soft!

Store leftovers in an airtight container in the fridge to add to any and everything.