Lay a large sheet of foil on a chopping board with a tortilla on top and spread over the soured cream. A third of the way up the tortilla, lay a horizontal layer of half the chicken, put half of the slaw mix on top and finish with jalapeños and a splash of Tabasco, if you like. Fold each of the sides of the tortilla in, then use the foil to help you roll the tortilla round itself – squeezing to enclose, then seal the foil. Repeat with the remaining tortilla and ingredients. Cut each in half to serve.