Preheat oven to 425 degrees.
Combine the hazelnut flour, all purpose flour, baking powder, sugar, cinnamon and salt in a large sized mixing bowl. Quickly add the cubed butter and using a pastry blender, cut in the butter until the mixture resembles coarse sand. Add the cherries and chocolate chunks and mix together one more time.
Using a rubber spatula, stir in the heavy cream until the dough begins to form, only for about 30 seconds to one minute. Transfer the dough to a lightly floured work surface and knead the dough by hand just until it comes together into a slightly sticky ball, for about 5-10 seconds.
Using a rolling pin (with parchment paper covering the dough), gently roll out. Using the parchment paper helps for a cleaner process. Do not roll the dough out too flat. Using your dough cutter, butter knife or pizza cutter, cut the dough into 8 wedges (like you are cutting a pizza) and place the wedges on a lined baking sheet (parchment paper or your Silpat non-stick baking mat).
Brush each wedge with the egg wash and sprinkle with Turbinado sugar. Bake for about 20-22 minutes, (rotating the baking sheet halfway through), or when the tops are golden brown. Remove from oven and cool on a wire rack for at least 10 minutes. Serve warm or at room temp.