75g cake flour

60g milk

45g unsalted butter (3tbsp)

150g sugar (0.75cup)

5 large eggs

1tsp baking powder

all ingredients to room temperature. Oven to 400F. grease 17.5inch by 11.5inch baking sheet, AND line the baking sheet with parchment. Sift flour.

melt butter in a sauce pan, with milk.

in a large bowl or stand mixer, whisk together sugar and eggs (and I think flour?) until lightly colored, tripled in volume, and consistency of softly whipped cream (around 5 minutes), then beat in baking powder.

reheat butter and milk until steaming hot. Sift flour “mixture”(?) in 3 additions over top of egg mixture, and fold in. add hot milk mixture all at once, fold in until well combined.

scrape into pan, spread evenly. Bake until top is golden brown and springy, 8 to 10 minutes.

while still hot, run a knife along the edges to get it to release, then invert onto more parchment paper. Let cool completely.

pull off parchment paper, along with crust.

add filling