Preheat the oven to 190°C (375°F) and line a baking tray with parchment paper.
Add all of the ranch sauce ingredients to a bowl and mix well. Set aside a third of it for the chicken marinade and store the rest in the fridge until ready to serve.
Add the chicken thigh to a bowl with the onion powder, garlic powder, smoked paprika, chilli flakes, the reserved ranch sauce, and salt and pepper. Mix well to coat, then place onto the prepared tray and bake for 16-18 minutes. Remove and let it rest before slicing or dicing.
While the chicken bakes, prepare the avocado, sliced, diced, or mashed, whichever you prefer, and grate the mozzarella.
Spread the remaining ranch sauce across the five tortillas, then add the chicken, avocado, and mozzarella, and season with salt and pepper. Wrap tightly, then wrap again in food-safe paper, foil, or a food-safe bag. Eat hot, warm, or cold.