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Line an 8″x 12″ baking pan with parchment paper and lightly grease it.
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Sift together the flour, cornstarch, and baking powder.
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Place the eggs in a stand mixer fitted with the whisk attachment. Beat the eggs for 30 seconds. Add the sugar and beat for 8 minutes until creamy.
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Place the butter in a separate bowl and cover with the boiling water. Let the butter melt then stir to combine.
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Preheat the oven to 350 degrees F.
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Slow the mixer down to low and add the dry ingredients to the egg and sugar mixture.
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Add the melted butter and water and combine thoroughly.
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Scrape the batter into the prepared pan. Place in oven and bake for 25 minutes or until a knife inserted in the middle of the cake comes out clean.
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Remove from oven and let stand 10 minutes.
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Whisk together the sweetened condensed milk, evaporated milk and whole milk.
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Use a fork to poke holes all over the top of the cake and evenly pour the milk mixture over the top until the cake is soaked. Don’t over soak the cake. The liquid should be completely absorbed with no residue sitting on top of the cake. Pour half of the liquid over the cake at first, let the cake absorb the liquid and then add a bit at a time until the cake is soaked. Reserve the rest of the milk mixture if you have some left over.
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Let the cake stand for two hours at room temperature and then Place it in the refrigerator for another 30 minutes.