Preheat oven to 400°F (200°C).

In a skillet, brown ground beef. Drain fat, then stir in taco seasoning, water, and salsa. Simmer until thickened.

In a greased pie dish, layer tortillas, beef mixture, and cheese. Repeat layers, ending with a tortilla on top.

Drape puff pastry over the top and tuck in edges. Brush with egg wash.

Bake for 20–25 minutes, until puff pastry is golden and puffy.

Let cool 5 minutes, then flip the pie onto a serving plate. Slice and serve with your favorite taco toppings!