Preheat your oven to 150℃.
Place chicken thighs in a medium-high heat oven safe pot. Sear in olive oil and a sprinkle of salt until they are nice and browned - the thighs do not need to be fully cooked.
Remove the chicken thighs, keep them in a covered bowl on the side.
Thinly slice the onions. Then place them in the pot the chicken was in. Use a little bit of the chicken stock to deglaze the pot if needed.
Season the onion with a little bit of salt, and add the butter. Let the butter melt, turn the heat down to low, then place a lid on the pot. Leave the onions to caramelise for 25-30 minutes. Be sure to check every now and then that they are not burning.
After the onions are a nice deep colour, grate/crush in the fresh garlic. Then pour in the paprika, garlic powder, italian herbs, and chicken powder. Also add the onion soup mix. The onions should now be similar to a paste consistency.
Pour the remaining chicken stock into the pot. Stir and the sauce should form, the liquid should thicken.
Place the chicken back into the pot. Put the lid on the pot, and pop it into the oven for a further 20 minutes.
Remove the caramelised onion chicken from the oven, stir the sauce if a layer has formed on top. Leave the lid on the pot, but leave it to sit for 5 minutes before serving.
Enjoy!