Heat 250 ml (1 cup) whole milk in a saucepan until steaming.

In a bowl, whisk 3 egg yolks + 60 g (¼ cup + 1 Tbsp) granulated sugar + 15 g (1½ Tbsp) cornstarch until pale.

Slowly whisk in the hot milk to temper.

Return mixture to pan; cook over medium heat, whisking, until thickened and bubbling (2–3 minutes).

Off heat, whisk in 30 g (2 Tbsp) butter + 100 g apple butter + 2 Tbsp brown sugar + ½ tsp cinnamon + pinch nutmeg + 1 Tbsp apple cider.

Strain, cover with plastic wrap touching surface, and chill 2 hours.

Melt 14 g (1 Tbsp) butter in a skillet.

Add 150 g (1 cup) diced apples + 25 g (2 Tbsp) brown sugar + 1 tsp cinnamon + pinch salt.

Cook 4–5 minutes until glossy and tender.

Stir in 1 tsp cornstarch during last 30 seconds until juices thicken.

Transfer to a plate and cool fully.

Mix 60 g (¼ cup) softened butter + 75 g (⅓ cup) brown sugar until smooth.

Add 75 g (½ cup + 1 Tbsp) flour + pinch salt; mix into a dough.

Roll between parchment to ⅛-inch thick.

Freeze while you prepare the choux pastry

You will cut into 2-inch circles after you pipe out your choux pastry.

In a saucepan, bring to a boil:

120 ml (½ cup) water + 120 ml (½ cup) milk + 113 g (½ cup) butter + 12 g (1 Tbsp) sugar + ½ tsp salt.

Add 125 g (1 cup) flour all at once; stir 2–3 minutes until dough pulls from sides.

Transfer to mixer; beat 1–2 minutes to release steam.

Slowly add beaten eggs (about 3–4 eggs total), checking for the “V-shape” batter test after each addition.

Mix in ½ tsp vanilla if using.

Pipe 2-inch mounds on a silicone mat.

Top each with a frozen craquelin disc.

Bake 15 min at 400°F, then 15–25 min at 350°F until deep golden.

Pierce each puff, turn off oven, crack door, and dry inside 10–15 min. Let cool completely.

Whip 120 ml (½ cup) heavy cream + 1½ tsp powdered sugar + ½ tsp vanilla to medium-stiff peaks.

Whisk your chilled pastry cream to loosen.

Fold in half of the whipped cream gently.

Fold in the remaining whipped cream until smooth and airy.

Chill 1 hour before piping.

Slice tops off cooled puffs.

Pipe a layer of apple diplomat cream inside base.

Spoon in 1–2 tsp caramelized apples.

Add a little more diplomat cream.

Replace tops slightly off-center.

Dust with powdered sugar.

Bake until deep golden; pale puffs will collapse.

Craquelin ensures even rise and a perfect crackly top.

Always chill pastry cream completely before folding into whipped cream.

Re-crisp empty shells at 350°F for 5 minutes if made ahead.

Caramelized apples should stay slightly firm for texture contrast.