Preheat the oven to 350 degrees Fahrenheit and line a sheet pan with parchment paper, set aside.
In a large bowl, combine the all-purpose flour, granulated white sugar, light brown sugar, and baking powder. Mix well.
Cut the cold butter into the flour and sugar mixture using a pastry cutter until the butter has created pea sized chunks. Set aside.
In a different bowl whisk the large egg and buttermilk together until smooth and even.
Add the buttermilk mixture to the butter and flour mixture and mix together carefully until the flour mixture is wet.
Toss in the frozen cranberries and gently fold everything together until a dough forms.
Flour a surface on the countertop.
Divide the dough into two. Using your hands, shape the dough into two flat circles on the countertop that are about 1 inch thick.
Use a knife or pizza cutter to cut each circle of dough into 8 triangular wedges, just like a pizza.
Place the wedges on the prepared sheet pan and bake in the oven for 14-16 minutes or until they start to turn golden brown.
Once the scones have cooled, mix together powdered sugar and heavy cream to create a thick, pourable glaze. Drizzle the top of each scone with the glaze. Serve immediately.