Preheat the oven to 425 degrees F and line a baking sheet with parchment paper. Or, pre-heat your air fryer to 400 degrees F.
Toss the halved brussel sprouts to with avocado oil and spices/ seasonings listed above (omit spices from the spiced oil section).
Place them on the baking sheet.
Roast or fry the brussel sprouts for 30 minutes in the oven or 10-12 minutes in the air fryer, tossing halfway through.
Remove, squeeze fresh lemon juice on top (optional). Set aside.