01 - Heat olive oil in a large skillet over medium-high heat. Add the chopped onion and cook until translucent, about 2 minutes.
02 - Add the minced garlic and cook for 30 seconds until fragrant. Add the ground beef and cook, breaking it apart with a spoon, until fully browned, about 5 to 6 minutes.
03 - Stir in the taco seasoning, tomato paste, and water. Simmer for 2 to 3 minutes until the mixture thickens. Season with salt and pepper to taste, then remove from heat.
04 - Soften the flour tortillas by warming them briefly in a microwave or dry skillet until pliable and easy to fold.
05 - Lay each tortilla flat. Spread 2 tablespoons of nacho cheese sauce in the center. Top with a quarter of the seasoned beef mixture, then sprinkle with cheddar and Monterey Jack cheeses.
06 - Place a tostada shell on top of the cheese. Spread 1 tablespoon of sour cream over the shell, then layer with shredded lettuce and diced tomatoes.
07 - Carefully fold the edges of the tortilla up and over the center, pleating as you go, until the filling is completely enclosed.
08 - Heat a large skillet over medium heat. Place each crunch wrap seam-side down and cook for 2 to 3 minutes per side until the exterior is golden and crisp.
09 - Slice each crunch wrap in half and serve immediately while hot.