Preheat the oven to 400 degrees. Line a sheet pan with parchment paper.
In the bowl of an electric mixer fit with the paddle attachment, mix flour, sugar, baking powder, cinnamon and salt. Add the cold grated butter and mix at the lowest speed until the butter is mostly combined and the dough looks craggy, about 20-30 seconds.
Mix the egg, ½ cup of heavy cream, and vanilla extract in a small bowl. With the mixer on low speed, slowly add the wet ingredients to the flour and butter mixture. Mix for about 30 seconds and then add the chopped apples and mix until just combined. The dough will look lumpy and may not be fully incorporated yet!
Dump the dough onto a floured surface and use your hands to form it into a disc pressing any dry ingredients into the dough to combine. If the dough seems too dry you can add more heavy cream to help bring it together.
Shape the dough into a circle, about 1-inch thick and 8 inches in diameter. You should still see small pieces of butter in the dough. Slice the circle into 8 wedges. Place the scones onto the prepared sheet pan.
Place the sheet pan with the scones into the freezer for 30 minutes or into the refrigerator for 1 hour. After chilling, brush the tops of the scones evenly with 1 tablespoon of the melted butter. Pile the cinnamon crunch topping evenly over the scones and then press the topping into the top of the scones using your fingers.
Bake for about 13-15 minutes, until the bottoms are golden brown and the scones look set with the topping browning. Let the scones cool on the baking sheet for 5 minutes and then remove to a wire rack to cool completely .