Prep the setup (2 minutes): Set out your skillet and lid. If using ring molds, lightly grease the inside of 3 rings (and a whisper of oil on the outside edge too, so they lift cleanly). Cut small parchment rounds for the skillet if you like extra insurance against sticking.
Batch note: This recipe makes 6 small pancakes total, usually cooked as 2 batches of 3 in a standard skillet. If you have a large griddle with a lid and space for 6, go for one batch. Otherwise, plan for two fast rounds.
Mix the yolk batter (4 minutes): In a medium bowl, whisk egg yolks, milk, and vanilla until smooth, 30 seconds. Sift in flour, cornstarch, baking powder, and salt. Whisk just until no dry streaks remain, 30 to 45 seconds. The batter should be thick but smooth.
Whip the meringue (6 to 8 minutes): In a clean, dry bowl, beat egg whites on medium speed until foamy, 45 seconds. Add cream of tartar, then continue beating. Sprinkle in sugar gradually over 60 to 90 seconds. Increase to medium-high and beat to stiff, glossy peaks, 3 to 4 minutes more. If the peak droops, keep going. If it looks dry and clumpy, it is over-whipped.
Fold without murdering the air (2 to 3 minutes): Stir 1/3 of the meringue into the yolk batter to loosen it. Then add the remaining meringue in 2 additions, folding gently with a spatula. Use big scoops and turn the bowl as you fold. Stop when you see no white streaks, usually 20 to 30 folds total. Do not overmix.
Preheat the skillet (3 minutes): Heat a nonstick skillet over low for 3 minutes. Lightly oil the surface and wipe with a paper towel so you have a thin sheen, not puddles. The pan should not sizzle aggressively; it should feel calm.
Shape the pancakes (2 minutes): Ring-mold method (Batch 1): Place greased rings on the skillet. Spoon or pipe batter into each ring about halfway up. Wait 30 seconds, then add a second scoop to build height, filling rings about 3/4 full.
No-ring method (Batch 1): Spoon or pipe 3 thick mounds (about 3 inches wide). Wait 30 seconds, then add a second mound on top of each to create a taller dome.
Cook side one with steam (7 to 8 minutes total): Cover the skillet with a lid. Cook on low for 4 minutes. Lift the lid quickly and add 1 tablespoon water to the empty area of the pan (not on the pancakes). Cover again and cook 3 to 4 minutes more. The tops should look matte and slightly set, not wet.
Flip carefully (1 minute): If using rings, you can keep them on for the flip. Slide a thin spatula under each pancake. Flip in one confident motion. If a pancake sticks, give it 30 seconds more and try again. If the top is still very wet, it is not ready.
Cook side two with steam (5 to 6 minutes total): Cover and cook 3 minutes. Add another 1 tablespoon water to the pan, cover, and cook 2 to 3 minutes more. Doneness cues: they should feel springy, and the sides should look set with no wet batter lines. If you like numbers, an internal temp around 190°F to 200°F (88°C to 93°C) in the center is a solid target.
Hold and repeat (Batch 2): Transfer Batch 1 to a plate and tent loosely with foil while you cook the remaining batter. Wipe the pan lightly, re-oil, then repeat shaping and cooking for the last 3 pancakes. Work efficiently, because the batter loses oomph as it sits.
Finish and serve (1 minute): Move to plates. If using rings, slide them up and off. If they cling, run a thin knife around the inside edge first. Serve immediately with butter and syrup, or whipped cream and fruit. These pancakes wait for no one.
