In a mixing bowl add chicken breasts, avocado oil, yellow mustard, garlic powder, dill powder, oregano, steak spice, salt, pepper. Coat the chicken nicely. Do not add lemon juice until you are ready to cook.
Let chicken sit in marinade for at least 20 minutes, the longer the better. You can even marinade overnight.
Preheat the oven to 400F. Once ready to cook add juice of ½ a lemon and combine. Heat an oven safe pan to medium high heat with a little cooking spray or oil. Once hot add chicken and cook on each side 3-4 minutes until nicely browned but not cooked through.
Transfer the pan to the oven and bake for 8-10 minutes or until cooked through. If you like your chicken nice and crispy you can broil each side for 30 seconds on the top rack of the oven.
Add a little extra lemon juice, garnish with fresh dill or parsley if you have and enjoy!