In a bowl, combine the apple slices and brown sugar. Add a sprinkle of salt, a squeeze of lemon and some cinnamon (½ tsp is what I use). Let the apple slices macerate for 2-6 hours, depending on how soft you want them (the longer they sit the softer they get).
Once the apples are soft, you’ll see a liquid at the bottom of the bowl. Strain the apples and set them aside. Pour the liquid into a pan and cook on medium until it's reduced to a few tablespoons.
Whisk together 2 tablespoons of the reduced juice, heavy cream, egg and vanilla.
In a large bowl, whisk together the flour, baking powder, sugar, salt and cinnamon if using. Cut in the butter with a pastry cutter until you the butter is pea sized. Pour in the liquid ingredients and combine with a rubber spatula until the dough comes together in a ball. Use your hands to bring it together.
Sprinkle flour onto your work surface and flatten the dough into a thick rectangle. Roll it out into a rectangle to about ½ inch thickness. Spread the drained apples all over the dough, leaving a border.
Roll up the dough into a log from the shorter side, try not to have a too thick log otherwise it will take longer to bake in the oven and the bottoms will over-bake.
Slice the log into V shapes, you’ll have about 9 scones. Set on the parchment paper with space between each scone. Return to freezer for at least an hour to completely freeze scones.
Preheat oven to 400 F. Brush the top of the scones with heavy cream and sprinkle sugar on top, if desired. Bake for 20-25 minutes, until golden on the bottom.