In a bowl, combine the butter and flour, salt, and sugar until a sandy consistency is reached. Add in the egg and water and mix until a dough forms. Press into a tart pan or pie pan (you may need to wet your fingers to make this easier). Prick with a fork and bake for 20 to 25 minutes or until golden brown. Allow to cool before filling.

In a bowl, combine the almond flour, salt, and sugar with the butter until sandy. Add the egg, extracts, and bourbon until a paste forms. In another bowl, mix the apple butter, cinnamon, and sugar until combined.

Spread the apple butter mixture in a thin layer over the cooled crust. Then top with the almond mixture. Gently spread over the apple mixture. This works best by placing large clumps of the batter over the apple butter mixture and then gently pressing to combine and flatten it.

Top with slivered almonds and bake for 25 to 30 minutes or until the almond layer is golden and slightly puffed. Sprinkle with confectioners’ sugar if desired, then slice and serve.