Whisk all dry ingredients in a large bowl.
Using a pastry cutter (or your hands) cut butter into the dry mixture until the butter pieces are the size of peas and covered in flour.
Mix buttermilk, 3/4 cup cream and egg in separate bowl.
Slowly pour into the butter and flour mixture and stir to combine until it just starts to come together.
Turn out onto a lightly floured surface and gently knead dough 4-5 times.
Roll dough into a 1" thick rectangle.
Fold into thirds and roll into another 1" thick rectangle.
Fold in half and gently roll into one last 1" thick rectangle.
Using a 3" round cookie cutter, cut out shortcakes.
Lightly spray a standard cookie sheet with cooking spray.
Place shortcakes onto the baking tray 2" apart.
Brush the tops of the shortcakes with remaining 1/4 cup cream.
Sprinkle the tops generously with the remaining 1/4 cup sugar.
Bake at 425 for 13-18 minutes, until golden brown then cool completely before serving.
In a large bowl beat together whipping cream, vanilla and sugar together until stiff peaks form. About 3-5 minutes.
Split shortcake in half, place a dollop of whipped cream on top and sprinkle with fresh blueberries.