Heat the oil in a large skillet over medium heat. Add the onions and apples to the skillet and cook until starting to soften, stirring from time to time. This will take around 3 minutes.
Add the bread to the skillet and continue cooking until it's wet from the juices the apples and onions are releasing. This should take around 10 minutes. If it's taking too much time or your fruit is really dry, you can add a little bit of water, white wine or chicken stock.
Stir in the apple cider vinegar, herbs, butter, salt and pepper. Allow to cook until the butter has melted and is coating everything, about another 4 minutes.
Stir in the parsley and either serve immediately OR chill for up to 24 hours before reheating.
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