Maple-Walnut Layer Cake With Easy Maple Frosting

[nverland]

Maple-Walnut Layer Cake With Easy Maple Frosting

For the cake:

Ingredients
1-1/2 cups walnut halves, plus extra for garnish
1 cup (2 sticks) unsalted butter, softened, plus extra for pans
3/4 cup granulated sugar
3/4 cup firmly packed light-brown sugar
3 large eggs
3 egg yolks
1 teaspoon vanilla extract
3 cups cake flour, plus extra for pans
1-1/2 teaspoons baking powder
1 teaspoon kosher or sea salt
3/4 teaspoon baking soda
1 cup maple syrup
1/2 cup milk
1/2 cup sour cream

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