Preheat oven to 400°F and line a baking sheet with parchment paper.
Wash, dry, and chop strawberries into small pieces. Pat completely dry.
Cut cold butter into small cubes and place in freezer while preparing other ingredients.
Whisk together flour, sugar, baking powder, and salt in a large bowl.
Add frozen butter cubes to flour mixture and cut in using a pastry cutter or fingertips until mixture resembles coarse crumbs with pea-sized butter pieces.
Add chopped strawberries and toss gently to coat with flour.
Whisk together heavy cream, egg, and vanilla extract in a small bowl.
Pour cream mixture into flour mixture and stir gently with a fork until dough just comes together.
Turn dough onto a lightly floured surface and pat into a 1-inch thick circle.
Cut circle into 8 wedges using a sharp knife in straight downward motions.
Place wedges on prepared baking sheet, spacing 2 inches apart. Brush tops with cream and sprinkle with coarse sugar if desired.
Bake for 18-22 minutes until golden brown on top and bottom.
Cool on baking sheet for 5 minutes, then transfer to a wire rack.