To make the mashed potatoes, cook peeled and diced potatoes in a pot of water until fork tender. Drain and set aside in the pot.
Roast the poblano and habanero for about 6 to 8 minutes per side on a baking sheet under the broiler in the oven. It may be a shorter roast time depending on your own, so watch closely. Ensure you place the baking sheet on the middle rack rather than too close to the element. You can also char them over an open flame if you have a gas range stovetop. Cook for about 5 to 8 minutes per side, turning them occasionally with a pair of metal tongs to get the peppers evenly charbroiled. Either way, do not leave these unattended or forget about them! They’re done when they’ve softened a bit and the skins is blistered and charred all over. Immediately place the peppers in a plastic bag and tie it. This will allow them to sweat and steam helping to remove the skins easily. Leave them in the bag while you prepare the jackfruit.
Drain jackfruit from the can in a fine mesh sieve. Rinse well with fresh water while breaking it up with your hands until it looks shredded. Squeeze dry with a clean tea towel or in a nut milk bag and continue to shred by hand into a mixing bowl.
Remove the poblano pepper and habanero from the plastic bag. Scrape off the skin of the poblano with the back of a knife or your hands. It should come off very easily. Split the pepper in half and remove the inside seeds. Dice the pepper. I use gloves to cut these, especially the habanero. Deseed and finely dice the habanero.
Heat oil in a large pan over medium-high heat. Once hot add chopped onion, chopped poblano and habanero, and minced garlic. Saute for about 5 minutes. Add jackfruit, cumin, sage, liquid smoke, and a pinch of salt and pepper. Cook another 5 to 6 minutes. Add worcestershire and tomato paste and combine well cooking another 4 to 5 minutes. Add more salt, to taste, if needed at the end. However I made the mashed potaties pretty salty which is why this mixture isn't overly salted. Transfer the jackfruit ixture to a mixing bowl and set aside while you finish the potatoes. Wipe out the pan as you will use it to fry the flautas.
I like to push the potatoes through a ricer to ensure they get very smooth. You can also do this with a sieve. Rice them into a mixing bowl. Combine with melted vegan butter, salt and ground pepper.
While the potatoes and jackfruit mixture cool off, make the avocado sauce in a high powdered blender. Combine avocado, green onions, lime juice, vegan yogurt, cilantro, garlic powder, onion powder, and salt and ground pepper until very smooth.
Assemble the flautas by placing a portion of mashed potatoes and the jackfruit mixture in the center of the tortillas, then roll over and place seam side down in hot oil in your pan. Fry in batches for about 3 to 4 minutes per side. Remove fried flautas onto a wire rack placed over a baking sheet.
You can serve the avocado sauce in a bowl for dipping, or place flautas on a large platter. Drizzle or spoon the avocado sauce over top of the flautas and garnish with finely chopped red onion, cilnatro and radish slices if desired.