Preheat oven to 425°F. Line a baking sheet with parchment paper or a silicone baking mat.: The room will begin to smell faintly warm as the oven gains heat, and a steady rise to 425°F ensures quick oven spring that gives the scones lift. You'll notice the oven light reflecting on a clean sheet of parchment, and the sound of the oven clicking as it hits temperature. This high heat helps the butter steam rapidly, creating flakiness, so avoid skipping this step. A common mistake is not allowing the oven to fully preheat, which leads to flat, pale scones. Use an oven thermometer if your stove tends to run cool.
Whisk flour, sugar, baking powder, and salt. Add diced cold butter and cut in with a pastry cutter until the butter is worked in and the mixture is crumbly. Stir in the pudding mix.: When you whisk the dry ingredients, the air you trap helps the baking powder distribute evenly; the mixture should smell faintly sweet and citrusy once you add the pudding mix. As you cut in the cold butter , watch for pea sized lumps and a sandy texture that still has visible flecks of butter. These pieces melt during baking and make flaky pockets, so do not overwork the dough. A common pitfall is using softened butter, which blends too thoroughly and removes the lifting pockets.
Place the cream, egg, vanilla, and extract in a measuring cup. Whisk to combine. Create a well in the center of the dry ingredients and add the wet. Stir with a fork until just combined (there may still be some dry ingredients in the bottom of the bowl).: As you whisk the wet mix, it should look glossy and homogeneous. When combined into the dry, the dough will appear shaggy and slightly sticky; you might hear a quiet scrape from the fork as you stir. This undermixing is intentional because overworking develops gluten and makes scones tough. Avoid vigorous stirring and stop when you still see streaks of flour, since residual dry will hydrate during gentle kneading.
Turn out the dough onto a cutting board. Knead the dough a few times until the mixture comes together and is smooth. Cut the dough in half. Form each half of the dough into a disk that’s about 1-2” thick. Slice each into 8 wedges, for a total of 16 mini scones.: The dough, when turned out, should feel slightly tacky but not sticky to the touch. Kneading a few times brings it together into a cohesive mass and distributes the zest and butter pockets evenly. As you form each disk, press gently so the layers remain light. When slicing wedges, you should hear a soft thud as the knife moves through the dough. A frequent error is overkneading, which yields dense scones, so keep the handling brief and confident.
Place scones on prepared cookie sheet, 1-2” apart. Bake for 8-11 minutes, or until the bottoms are just golden brown. Cool completely before glazing.: As the scones bake, you will smell the buttery and citrus notes intensify, and the tops will take on a pale gold hue. When you lift one off the sheet, the bottom should be just golden and slightly crisp, while the interior remains tender. The quick bake time preserves moisture, so resist the urge to leave them in longer for extra color. A common mistake is overcrowding the pan, which prevents even browning; give them space to breathe for the best texture.
To make the glaze: whisk all ingredients in a small bowl. Drizzle over scones. Let set for a few minutes before serving or stacking.: whisk all ingredients in a small bowl. Drizzle over scones. Let set for a few minutes before serving or stacking. : The glaze should feel smooth and slightly glossy as you whisk powdered sugar with lemon juice and a pinch of salt . Drizzle slowly and watch it bead on the warm scone surface, then settle into shiny ribbons. The scent of fresh lemon intensifies now, and the sugar adds a pleasant crackle as it sets. If your glaze is too thick, a small additional drop of juice will loosen it; if too thin, add a dusting more powdered sugar . A typical misstep is glazing while the scones are still hot, which can make the glaze melt away, so allow them to cool sufficiently.