Preheat oven to 400° (F). Line a large baking sheet with parchment paper; set aside.: As the oven warms, you will notice a faint heat rising and perhaps the oven elements beginning to glow, which signals a consistent environment for even baking. Preheating is crucial because Strawberries and Cream Scones rely on a hot oven to create that initial steam from the cold butter , producing lift and flaky layers. A mistake here is putting the scones into an oven that is not fully hot, which yields flatter, denser scones. If your oven runs hot or cool, use an oven thermometer to verify the temperature so the scones brown evenly and do not dry out.
In a large bowl combine flour, salt, baking powder, baking soda, and sugar; mix well to combine.: At this stage you will feel the dry textures shift beneath your fingertips as the flour and leaveners mingle, with the granulated sugar adding a tiny grit that will help crust color. Mixing ensures the leavening agents are evenly distributed so the rise is uniform, and it prevents bitter pockets of unblended baking powder. A common error is skimping on mixing, which can produce uneven pockets of rise. Use a whisk or fork to fluff the dry mix, and look for a homogenous pale mixture before adding the cold butter .
Cut the butter into small cubes then work it into the mixture (using your fingers, two forks, or a pastry cutter) until it resembles a coarse meal.: As you rub or cut the unsalted butter into the dry ingredients, tiny glints of butter will appear like little beads within the flour, and the texture will change to a coarse, sandy consistency. This is the sensory cue you want because those bits will melt in the oven to create steam pockets, making the scones flaky. Avoid letting the butter soften; it should stay cold and tactile. Overworking here creates a dense dough, so stop once you reach the coarse meal texture.
In a small bowl whisk together the egg, milk, and cream. Add to flour/butter mixture and use a fork to stir everything together until just moistened.: The wet mix will glisten as you whisk, and when poured into the dry mix it will bind pockets of crumb into a shaggy dough. Using a fork limits overmixing, which preserves tenderness. You should see streaks of dry flour still visible when you stop; this prevents a tough scone. A slip-up is adding too much liquid too fast, which leads to a sticky, unworkable dough. If the dough feels too wet, briefly scatter a little extra flour and fold gently.
Add strawberries and using a rubber spatula gently fold them into the dough. Don’t worry if some of the berries break up a bit.: When you fold in the quartered strawberries , expect bits of pink juice to streak through the dough, which is fine and adds flavor. Folding gently keeps the berries from completely disintegrating while still distributing them. The reason for the gentle touch is to avoid releasing too much moisture into the dough, which would make the scones dense. A common mistake is stirring aggressively, which turns the dough gummy. Use a flexible spatula and only fold until the berries are evenly spread.
Empty the loose dough out onto a clean, floured work surface, then shape the dough into an 8-inch circle. You may need to knead the mixture a few times to get it to a workable texture.: When you turn the dough out it will feel slightly shaggy and cool to the touch from the cold butter . Lightly flour the surface and gently press the dough into an 8-inch disk, folding a few times to bring it together. This quick shaping layered technique encourages flakiness by preserving pieces of butter. Avoid heavy kneading which warms the dough and breaks down flakiness. If the dough sticks, dust with a little extra flour but resist adding large amounts.
Cut the dough into 8 wedges and carefully transfer them to the prepared sheet, placing them 2" apart.: As you slice the disk into wedges you will see clean, sharp edges that help the scones bake evenly and brown on the exposed sides. Transferring them with care preserves shape and prevents squashing the layers. Give them room because they expand slightly as the steam from the cold butter causes lift. A common oversight is crowding the pan, which results in uneven baking and soft sides where they touch. Use a thin spatula to gently move each wedge.
Lightly brush each scone with the egg wash, then sprinkle the tops with sugar.: Brushing on the beaten egg mixed with water gives the scones a glossy, golden finish and helps the sprinkling sugar adhere. You will notice a slight sheen once brushed, and the sugar will glint on top. The egg wash also aids in browning to create a pleasing contrast between crust and interior. Avoid dousing the tops, which can cause runny wash to pool and lead to uneven baking. A gentle, even brush stroke is all you need.
Bake for 18 minutes, or until light golden brown.: While baking, enjoy the warm aroma of baked flour and caramelizing sugars. The edges should become lightly golden and the tops set with a slightly crisp exterior. This hot environment creates steam that puffs the scones. A common error is underbaking, leaving them doughy inside, or overbaking, which dries them out. Check for color and a gentle bounce when pressed; if the center yields too much, give them a couple more minutes.
Allow scones to cool for 10 minutes on the baking sheet. In the meantime you can make your glaze.: Cooling briefly lets the interior set so the scones hold together when you drizzle the glaze. The surface will still be warm, which helps the glaze adhere and form a shiny coating. Resist cutting into them immediately, as the center continues to finish cooking and firms up. A mistake is slicing while piping hot, which can make crumbs and a slightly gummy interior.
In a small bowl whisk together the heavy cream, confectioners’ sugar, vanilla, and salt. Drizzle over semi-warm scones and serve at once.: The glaze should be smooth and pourable, with a slight sheen. As you whisk the heavy cream into the confectioners' sugar , it will thin and thicken to a satiny consistency that clings to the warm scones. Drizzling over semi-warm scones allows the glaze to set with a delicate shell while some sinks into the crumb for extra sweetness. Too thin a glaze will run right off; too thick and it will look clumpy. Aim for a ribbon like flow when you lift the spoon.