01 - Preheat the 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 blended.
03 - Add the cold, cubed butter. Using a pastry cutter or your fingertips, work the butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces remaining.
04 - In a separate bowl, whisk together cream, egg, and vanilla extract until combined.
05 - Pour the wet ingredients into the dry ingredients. Mix gently with a spatula or wooden spoon until just combined. Do not overmix.
06 - Gently fold in the diced strawberries until evenly distributed throughout the dough.
07 - Turn the dough onto a lightly floured surface. Pat into a 1-inch-thick circle, approximately 7 inches in diameter.
08 - Cut the circle into 8 wedges. Transfer to the prepared baking sheet, spacing wedges 2 inches apart.
09 - Brush the tops with a little heavy cream and sprinkle with coarse sugar if desired.
10 - Bake for 16 to 18 minutes, or until golden brown on top and a toothpick inserted into the center comes out clean.
11 - Cool on a wire rack for at least 10 minutes before serving warm or at room temperature.