Combine the avocado, mayonnaise, jalapeno pepper and lime juice in a blender or food processor. Add a splash of water and puree until smooth; season with salt and pepper, to taste. Scrape into a bowl.
Heat the oil in a large saute pan over high heat. Add the onion and pepper and cook until soft, about 5 minutes. Add the cumin and cook for 1 minute. Add the turkey, cook until just heated through and stir in the cilantro.
Put the tortillas on a plate, cover with a damp paper towel and microwave on high heat for 40 seconds to warm through. Put some of the turkey mixture in the center of each tortilla, drizzle with some of the Creamy Avocado Sauce, roll and serve.