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1
To make the topping: In a large saucepan, melt the butter over medium heat.
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2
Slide the pan from the heat and add the granulated sugar, brown sugar, cinnamon, nutmeg, and salt.
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3
Stir with a rubber spatula, pressing when necessary, until there are no lumps of sugar.
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4
Add the flour and mix until well blended and pasty.
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5
Set aside.
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6
To make the cake: Position an over rack on the middle run heat the oven to 350 degrees (180C).
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7
Lightly grease the bottom and sides of a 9-by-13-inch (75-by-33cm) baking pan or dish.
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8
In a large bowl, combine the flour, granulated sugar, baking powder, and salt.
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9
Whisk until well blended.
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10
In a medium bowl, combine the eggs, milk, melted butter, and vanilla.
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11
Whisk until well blended.
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12
Pour the wet ingredients over the dry ingredients and gently stir with a rubber spatula just until blended.
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13
Scrape the batter into the prepared pan and spread evenly.
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14
Break up the topping mixture with your fingers into medium-sized pieces and sprinkle evenly over the cake batter to form a generous layer.
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15
Bake until the cake springs back lightly when pressed in the center and a toothpick or cake tester inserted into the center comes out clean, about 40 minutes.
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16
Transfer the pan to a rack to cool.
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17
Serve warm or at room temperature.
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18
Before serving, sift some confectioners sugar over the top, if desired.
