01 -
Set your oven to 190°C. Get all ingredients ready as per the instructions.
02 -
In a big skillet on medium-high, throw in the ground beef and cook for 2 minutes, breaking it apart with a wooden spoon. Toss in the onion and keep cooking, stirring frequently, until the beef is brown and the onion is soft, around 5 minutes. Mix in the taco seasoning.
03 -
Add in water and keep cooking for another 2 minutes, stirring all the time and scraping the bottom of the pan. Take the skillet off the heat and set the beef mix aside.
04 -
Use 1 tablespoon of melted butter to grease a 23x33 cm baking dish. Lay 5 tortillas in the dish, allowing some to hang over the edge, overlapping them to thoroughly cover the bottom.
05 -
Sprinkle the shredded Cheddar all over the tortillas. Start with the cilantro, then layer on the diced tomatoes. Put sour cream in a bag, cut a corner, and pipe it evenly on top of the tomatoes.
06 -
Arrange tostada shells over the sour cream, overlapping them as needed. Spread the nacho cheese sauce on top of the tostadas.
07 -
Pour the reserved beef mix over the nacho cheese sauce, spreading it out evenly. Place the last tortilla right in the center above the beef mixture.
08 -
Fold the hanging tortillas over the middle tortilla to cover the filling. Brush the top with the rest of the melted butter and press down any stray edges.
09 -
Put the dish into the oven and bake for 30 minutes, or until it’s golden brown and the top is lightly toasted.
10 -
Take it out of the oven and wait for 5 minutes. Carefully flip the casserole onto a cutting board or serving platter.
11 -
Cut into pieces with a large serrated knife. Add shredded lettuce, more sour cream, guacamole, and hot sauce on top if you like.