Soften the onion in a pan with a little butter. Add the beef and break it up while cooking. Stir in the paprika, salt, pepper and tomato paste, then add a splash of hot water to keep the filling moist. Add Sriracha if using. Cook the beef through; ground beef should reach 71°C (160°F).
Mix the mayonnaise, minced garlic, garlic powder, Italian herbs and parsley. Add water gradually until spreadable, stopping before the sauce becomes runny.
Cut a slit from the centre of each tortilla to one edge. Arrange beef, tortilla chips, cheese and a little sauce across the four quarters. Starting beside the slit, fold each quarter over the next to make a triangle. Avoid overfilling.
Toast the folded wraps in a lightly buttered pan over medium heat, turning carefully, until golden on both sides and the cheese has melted. Serve warm.