Buttermilk Banana Cake

Ingredients

• ½ cup (1 stick) unsalted butter, room temperature, plus more for pan
• 2 cups (250 g) all-purpose flour
• ½ tsp. baking powder
• ½ tsp. baking soda
• ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, plus more
• ½ tsp. ground cardamom, plus more for sprinkling
• ¾ cup (150 g) granulated sugar
• ¾ cup (packed; 150 g) light brown sugar
• 2 large eggs, room temperature
• 1½ tsp. vanilla extract, divided
• 2 ripe bananas, peeled, flesh finely mashed
• 1¼ cups buttermilk, room temperature, divided
• 1½ cups (165 g) powdered sugar
• Flaky sea salt

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