For the Dough
1-1/2 cups all-purpose flour
2 tsp. sugar
1/2 tsp. salt
11 Tbs. cold, unsalted butter
1 large egg yolk
3 Tbs. whole milk
For the Filling
4 cups peeled, thinly sliced apples
1 tsp. vanilla extract
1/2 tsp. ground cinnamon
1/8 tsp. nutmeg
1 Tbs. all-purpose flour