In a large sauté pan, melt 12 tbsp unsalted butter over medium-high heat until it begins to deepen in color and turn golden brown. Remove from heat.
Add vanilla extract, 2 tsp ground cinnamon, and 1 tsp ground ginger. Stir to combine.
Add brown sugar and stir into a deep brown mixture. The butter may separate, which is fine.
Add your eggs, one at a time, and vigorously whisk them into the batter.
Sift in 1 1/4 cups AP flour, 1 tsp baking soda, 3/4 tsp kosher salt, and 1/4 tsp baking powder. Mix with a spatula until no streaks of flour remain.
Pour batter into an 8x8” square baking pan, lined with parchment paper with overhanging sides, slightly greased.
Rest batter in fridge for an hour, or until the dough becomes thick and non-pourable.
After an hour, peel, core, and chop apples into thin half-moons and add to a large bowl.
Add 1/3 cup sugar, 1 tbsp cinnamon, a pinch of sea salt, and 1/4 cup AP flour. Mix until all apples are thoroughly coated.
Pour apples onto the top of your chilled blondie batter and lightly spread evenly. Let rest in fridge, covered, for at least 1-2 hours, or up to overnight.
Combine 1/2 cup AP flour in a medium bowl with 1/2 tsp sea salt and 1 tbsp white sugar.
Add 4 tbsp diced unsalted butter, very cold, into the flour mixture and combine quickly. Then, work into a fine crumb with a fork, pressing butter into the flour.
Once you have a sandy, coarse mixture, add 2 tbsp cold water, one at a time. Depending on your climate, you may not need it all.
Bring the pie dough together into a small ball. No flour should remain and the dough should hold together. Wrap and place dough in fridge for at least 30 minutes.
Remove dough from fridge and let rest for 5 minutes. Then, generously flour your work surface and roll dough into an 8 x 8” square.
Cut 8 even vertical 8” strips of dough and place on top of your apple blondies in a lattice pattern.
Preheat oven to 350°F. Whisk an egg in a small bowl thoroughly. Then, brush the pie crust strips lightly with egg using a pastry brush.
Sprinkle the top of your crust with turbinado sugar and a pinch of sea salt. Bake for 30 minutes until golden brown.
If your pie crust hasn't cooked enough, turn the temperature up to 425°F and bake for another 3-4 minutes.
Let rest on wire rack for 30 minutes. Slice into 9 equal squares and serve warm.