Select the Preheat function on the Cosori Smart Air Fryer Toaster Oven, adjust temperature to 450°F, and press Start/Pause.
Line the food tray with foil and place the bell pepper halves on the tray.
Insert the food tray at mid position in the preheated oven.
Select the Roast function, adjust time to 20 minutes, and press Start/Pause.
Remove when bell peppers are charred. Immediately place bell peppers into a bowl and cover tightly with plastic wrap. Allow peppers to steam for 15 minutes. Remove plastic wrap, peel the skin off the peppers, and place into a food processor.
Place cumin and coriander seeds in a dry skillet. Toast over medium heat for 4-5 minutes or until fragrant.
Place seeds into a mortar and pestle or spice grinder and grind to a powder. Place into the food processor.
Heat olive oil in a pan over medium heat. Add the onion and garlic and saute for 10 minutes or until they begin to soften and caramelize. Place into the food processor.
Place the remaining ingredients into the food processor and blend until smooth. Taste and add additional lemon juice, salt, or olive oil if needed.