Toss sliced strawberries with sugar. Cover and set aside.
Preheat oven to 400 degrees.
Place flour, sugar,baking powder, baking soda, and salt in food processor. Pulse to combine.
Add butter to food processor and pulse until butter is incorporated and the flour has a sand like texture.
Pour 1 1/4 cups buttermilk into a mixing bowl. Stir in flour mixture until completely moistened. Add additional 1/4 cup of buttermilk to get completely combined.
Divide dough into 8 portions. Create mounds in baking sheet then brush with heavy whipping cream. Pat down dough unless you prefer peaks. Sprinkle with turbinado sugar.
Bake until edges are lightly browned, about 18 to 20 minutes. Allow to cool completely before serving.
To make whipping cream, add heavy whipping cream, sugar, and vanilla to a stand mixer. Whisk at high speed until peaks form, about 1 to 2 minutes.
Serve strawberry shortcake by slicing shortcakes in half across the width. Place bottom cake on serving plate, cover with strawberries, cover with whipped cream, then top with remaining shortcake.
Serve immediately.