Start by peeling, coring, and thinly slicing your apples. Toss them in a bowl with lemon juice to prevent browning.
In a separate bowl, combine the granulated sugar, brown sugar, cinnamon, nutmeg, salt, and flour.
Gently mix the dry ingredient mixture with the apples until they are evenly coated. Add vanilla extract for a warm aroma.
Roll out one of the pie crusts and place it in your pie dish. Add half of the apple mixture, then drizzle half of the salted caramel sauce over it. Add the remaining apples and sauce, and dot with butter.
Roll out the second pie crust and cut it into strips. Create a lattice pattern on top of your apple filling. Trim excess crust and crimp the edges.
Beat the egg and brush it over the crust for a golden finish. Sprinkle a pinch of coarse sea salt for that delightful contrast. Bake at 425°F (220°C) for 45-55 minutes, or until the crust is golden and the filling is bubbling.
Allow your pie to cool on a wire rack for at least two hours. This will help the filling set. Serve with a scoop of vanilla ice cream and an extra drizzle of salted caramel sauce for pure indulgence!