New Classic Celebration Cake

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Ingredients

1 cup (8 ounces or 225 grams) unsalted butter
2 tablespoons powdered milk
1 3/4 cups (350 grams) granulated sugar
1 teaspoon fine sea salt
1/2 teaspoon baking soda
4 teaspoons baking powder
2 3/4 cups (360 grams) all-purpose flour
2 large eggs
2 cups (475 ml) buttermilk, well shaken
1 tablespoon (15 ml) vanilla extract
1 cup (200 grams) granulated sugar
6 tablespoons (3 ounces or 85 grams) salted butter, in 1T slices
1/2 cup plus 2 tablespoons (135 grams) heavy cream, cold is fine
Sea salt flakes, for assembly
1 cup plus 2 tablespoons (225 grams) granulated sugar
1/3 cup (45 grams) cornstarch
1/4 + 1/8 teaspoon fine sea salt
3 large eggs, cold is fine
1 1/2 cups milk (355 ml), whole or low-fat, cold is fine
1 tablespoon vanilla bean paste or the seeds from 1 large vanilla bean
1 tablespoon (15 ml) vanilla extract
1 1/4 pounds (20 ounces, 2 1/2 cups, or 570 grams) unsalted butter, slightly cooler than room temperature (firm-soft, not mushy)

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