In a food processor or blender, add the whole bottle ranch dressing and the roughly chopped Serranos. Blend until you have a fine consistency and set aside.
Chicken tostadas
In a pan, add oil and heat up pan on med/high heat. Add the ground chicken OR tofu. Next add all of the seasonings, using a fork or wooden spoon, break up the ground meat and cook for 7-10 mins on med heat.
Assemble the Tostadas
Place the tostadas in the air fryer at 400°F for 3-4 mins until there nice and toasty. Place a nice layer of ground meat, followed by lettuce, tomatoes, onions, jalapeños and shredded cheese. Drizzle on the Serrano ranch and enjoy!