Prep the strawberries: In a bowl, combine sliced strawberries with 3–4 tablespoons sugar and the lemon juice. Stir and let sit for at least 20–30 minutes. They’ll release juices and get glossy and sweet.
Preheat the air fryer: Set it to 350°F (175°C).
Let it warm up while you make the dough.
Mix dry ingredients: In a large bowl, whisk the flour, baking powder, 2 tablespoons sugar, and salt until evenly combined.
Cut in the butter: Add the cold butter cubes. Use your fingers or a pastry cutter to work the butter into the flour until you have pea-sized bits. Keep some larger flakes for flakiness.
Add wet ingredients: Stir in the 3/4 cup heavy cream and vanilla.
Mix gently with a fork until a shaggy dough forms. If it’s dry, add 1–2 teaspoons more cream.
Shape the dough: Turn the dough onto a lightly floured surface. Pat it into a 1-inch-thick disk.
Fold the dough over itself once or twice to build layers, then pat back to 1 inch thick.
Cut the shortcakes: Use a 2.5–3-inch cutter or a glass rim to cut 6–7 rounds. Gently gather scraps and pat again to cut the last one. Avoid twisting the cutter to keep the sides rising evenly.
Prepare the basket: Line the air fryer basket with parchment or lightly spray it.
Make sure parchment is trimmed so it won’t touch the heating element.
Brush and sugar: Arrange 3–4 shortcakes in a single layer with space between them. Brush tops with a little cream and sprinkle with turbinado sugar for crunch.
Air fry the first batch: Cook at 350°F for 8–10 minutes, until the tops are golden and the centers are set. An inserted toothpick should come out clean.
Repeat: Air fry remaining shortcakes.
Let them cool on a rack for 5–10 minutes so they set but stay warm.
Whip the cream: If making homemade, whip heavy cream with powdered sugar and vanilla to soft peaks. Keep it billowy, not stiff.
Assemble: Split shortcakes horizontally with a serrated knife. Spoon on macerated strawberries with some of their juices, add whipped cream, top with the other half, and finish with more berries and cream.
Serve immediately: Shortcakes are best warm, with the juices soaking into the crumb.