1Peel, core, and dice 4 pounds of firm, crisp apples. Use a variety for flavor and texture (Pink Lady, Honeycrisp, Granny Smith).
2Toss the apples with 3 Tbsp of lemon juice to prevent browning.
3In a bowl, combine the diced apples with ½ cup of sugar, ½ cup of light brown sugar, 2 ½ tsp of cinnamon, ½ tsp of kosher salt, and 1 ½ tsp of freshly grated nutmeg.
4Toss to coat the apples evenly.
5Heat two 12-inch skillets to medium heat. Add one stick of unsalted butter to each skillet.
6Divide the apple mixture evenly between the two skillets.
7Bring to a bubble, then reduce heat to medium-low. Stir periodically until tender-crisp, about 6-7 minutes.
8Stir in ¼ cup of flour in each skillet and cook for 1 minute, until combined.
9Remove from heat and stir in 1 ½ tsp of vanilla extract in each skillet.
10Divide the apple filling between the two pie crusts. Top with the other pie crust and weave a lattice top.
11Brush with egg and sprinkle with sparkling sugar.
12Bake at 425°F for 15 minutes, then reduce temperature to 350°F and bake for 45 minutes. Do not open the oven door during baking.