01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, and salt until well combined.
03 - Add cold cubed butter to flour mixture. Using a pastry cutter or fingertips, work butter into flour until mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together heavy cream, egg, and vanilla extract until smooth.
05 - Pour wet ingredients into dry ingredients. Mix gently with a spatula until just combined. Do not overmix.
06 - Gently fold diced strawberries into dough until evenly distributed.
07 - Turn dough onto lightly floured surface. Pat into a 1-inch-thick circle, approximately 7 inches in diameter.
08 - Cut circle into 8 equal wedges. Transfer wedges to prepared baking sheet, spacing 2 inches apart.
09 - Brush tops of scones with additional heavy cream. Sprinkle with coarse sugar if desired.
10 - Bake for 16 to 18 minutes until tops are golden brown and edges are set.
11 - Transfer scones to wire rack. Cool for at least 10 minutes before serving.