Over medium heat, melt butter in a medium saucepan or skillet.
Add both diced apples and cook, stirring occasionally, for 3 minutes.
Stir in brown sugar, cornstarch, cinnamon, nutmeg, ginger, and lemon juice. Cook 3 more minutes, stirring occasionally, until apples are soft.
Remove from heat; add vanilla. Set aside.
Unfold both sheets of puff pastry onto a lightly floured surface (I use a baking sheet to contain the mess). If the folds crack or split a little, just wet your fingertips and pinch them back together.
Using a sharp knife, cut each sheet into four squares, creating a total of eight squares.
Place 2-3 tablespoons of the apple mixture in the middle of each square.
In a small bowl, beat egg white and water together to create a wash.
Brush around the edges of one square then fold in half on the diagonal, creating a triangle shape.
Press seams together, then use a fork to seal both sides.
Place on an ungreased baking sheet and repeat with remaining squares.
Lightly brush remaining egg wash over the top of each pastry.
Bake 15-20 minutes, until pastry has puffed and the tops are golden brown.
While turnovers are baking, stir together the confectioner's sugar and creamer to create a glaze.
Drizzle glaze over each turnover when finished baking.
Recipe by Views From the Ville at https://viewsfromtheville.com/2014/09/12/apple-turnover-recipe-vanilla-glaze/