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1
Sift flour, baking powder, and salt together; set aside.
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2
Whisk eggs and caster sugar until pale and doubled, 8 minutes; fold in flour mixture gently.
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3
Divide batter between two greased 23cm cake tins; bake at 175°C for 25–30 minutes until golden and a skewer emerges clean.
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4
Cool cakes 15 minutes, then pierce entire surfaces repeatedly with a fork.
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5
Whisk evaporated, condensed, and whole milk; pour over both cakes slowly until absorbed.
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6
Chill 2 hours minimum; whip heavy cream with vanilla and 10g cinnamon to stiff peaks.
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7
Frost cake thickly with whipped cream; dust with remaining cinnamon.
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8
Refrigerate 4 hours or overnight before serving.