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For the cake: – 3 cups (372 grams) all-purpose flour – 1 1/2 teaspoons baking soda – 1/4 teaspoon salt – 1/2 teaspoon ground cinnamon – 10 tablespoons (142 grams) unsalted butter, at cool room temperature – 1/2 cup (100 grams) granulated sugar – 1/2 cup (100 grams) light brown sugar – 1 teaspoon vanilla extract – 3 large egg – 1 1/3 cups (300 grams) mashed bananas, from about 4 medium banana – 1 cup (227 grams) sour cream – 1/2 cup whole milk – 3/4 cup (106 grams) California walnuts, chopped For the frosting: – 8 ounces (227 grams) cream cheese, at cool room temperature – 1 stick (113 grams) unsalted butter, at cool room temperature – 2 teaspoons vanilla extract – 2 cups (250 grams) powdered sugar, sifted – Chopped walnuts, for garnish
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