Place the thighs in the baking dish.
In a small pot gently melt the ghee or butter.
Add the mustard and mix thoroughly. Add the salt and pepper and mix. Taste it to be sure it is spicy enough.
Brush all the sauce on all the chicken thighs.
Bake at 350 degrees F for 25 – 30 minutes.
After 30 minutes, increase the temperature to 400 degrees F and bake for 8 more minutes until nicely browned.
If you are unsure if they are cooked through, the temperature should be 165, or cut a piece at the thickest part to see if it is thoroughly cooked.