01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together the flour, sugar, baking powder, and salt until well blended.
03 - Add the cold butter cubes. Using a pastry cutter or your fingertips, cut the butter into the dry ingredients until the mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together the cream, sour cream, egg, and vanilla extract until smooth.
05 - Pour the wet mixture into the dry ingredients. Stir gently just until combined; do not overmix.
06 - Gently fold in the diced strawberries, being careful not to overmix or crush the fruit.
07 - Turn the dough onto a lightly floured surface. Pat it into a 1-inch-thick round disc.
08 - Use a sharp knife or bench scraper to cut the dough into 8 equal wedges.
09 - Transfer the scones to the prepared baking sheet, spacing them about 2 inches apart to allow for spreading.
10 - Brush the tops with heavy cream and sprinkle with coarse sugar, if desired.
11 - Bake for 16 to 18 minutes, or until the scones are golden brown and a toothpick inserted into the center comes out clean.
12 - Cool on a wire rack for 10 minutes before serving warm.