Banana Sheet Cake with Passion Fruit Frosting

Ingredients

• 1 stick unsalted butter, melted and cooled, plus more, softened, for pan
• 1 ⅔ cups unbleached all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• 1 teaspoon kosher salt (we use Diamond Crystal)
• 4 large eggs, room temperature
• 1 ½ cups granulated sugar
• 3 medium ripe bananas, well mashed (1 cup)
• ½ teaspoon ground cinnamon
• 2 teaspoons pure vanilla paste or extract
• ¾ cup sour cream, room temperature
• 1 pound cream cheese, room temperature
• 4 tablespoons unsalted butter, softened
• 1 ½ cups confectioners' sugar, sifted
• ¼ cup fresh passion-fruit juice (from 4 to 5), plus pulp for serving

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