INGREDIENTS
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Cookie for crust
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2/3 cup plus 1 tablespoon (3 ounces) flour
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Scant 1/8 teaspoon baking powder
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Scant 1/8 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup (1 stick) softened butter
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1/3 cup (2 1/2 ounces) light brown sugar
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3 tablespoons (1 1/4 ounces) sugar
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1 egg
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Scant 1 cup (3 1/2 ounces) rolled oats
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Crust
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Crumbled cookie for crust
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1/4 cup (1/2 stick) butter
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1 1/2 tablespoons (3/4 ounce) brown sugar
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1/8 teaspoon salt
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Filling
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1 1/2 cups (10 1/2 ounces) sugar
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3/4 cup plus a scant 3 tablespoons (7 ounces) light brown sugar
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1/4 teaspoon salt
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1/3 cup plus 1 teaspoon (3/4 ounce) milk powder
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1 cup (2 sticks) butter, melted
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3/4 cup plus a scant 2 tablespoons heavy cream
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1 teaspoon vanilla extract
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8 egg yolks
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2 prepared crusts
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Powdered sugar, garnish