Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a large bowl, whisk together the flour, baking powder, salt, and 1/4 cup of sugar.
Cut in the cold butter using a pastry blender or your fingers until the mixture resembles coarse crumbs.
Stir in the milk and vanilla extract until just combined. Don’t overmix—it should look a little shaggy.
Turn the dough out onto a floured surface, knead a few times, and pat into a 1-inch thick rectangle.
Cut out biscuits using a round cutter and place them on the baking sheet.
Whisk together the egg and water to make an egg wash. Brush the tops of the biscuits and sprinkle with a bit of sugar.
Bake for 12–15 minutes, until golden brown. Let cool on a wire rack.
While the biscuits bake, toss the sliced strawberries with the remaining 1/4 cup sugar in a bowl. Let them sit and get syrupy.
In another bowl, whip the cream until soft peaks form. Add powdered sugar and vanilla if desired, then whip until fluffy.
To assemble, slice the biscuits in half, spoon on strawberries and juice, add a generous dollop of whipped cream, then top with the biscuit lid.
Serve immediately and enjoy the sweet, crumbly, creamy joy you just created.