Preheat oven to 350°F and line a large baking sheet with parchment paper or a silicone mat.
Start by making the flax egg: stir the ground flaxseed and water together in a small bowl and set aside.
Next, stir the flour, sugar, baking powder, and salt together in a large bowl, then add the cold butter (I like to use a large cheese grater for this) and use your hands to combine everything until the butter resembles small pebbles (this takes a minute or two so be patient).
Next, add the flax egg, melted butter, milk, and vanilla to that bowl and stir everything together with a wooden spoon. Last, fold in the chopped apples.
Flour a clean surface, then pour the dough out onto it and use your hands to form the dough into a large ball. Flatten the ball into a disc that’s about 7-8” wide and ½” thick.
Use a large knife to make 4 cuts into the disc, creating 8 scones. Place them onto the prepared baking sheet, then brush each scone with a little melted butter (optional).
Place the baking sheet in the oven and bake the scones for 20-25 minutes.
Meanwhile, make the cranberry glaze: add the cranberries, water and sugar to a saucepan and bring them to a boil. Reduce heat to a simmer and simmer for 8-10 minutes, using a wooden spoon to help break down the cranberries.
Place a mesh strainer over a bowl, then pour the cranberries through it. You should be left with cranberry syrup. At this point, you can discard the mashed cranberries.
Take 2 tablespoons of the syrup and add it to a large bowl, along with the milk and powdered sugar. Use a hand mixer to whisk until the glaze is smooth.
Once the scones are done, transfer them to a wire rack. Allow the scones to cool before adding the glaze. Once ready, drizzle the glaze over each scone and enjoy!