3/4 cup (1 1/2 sticks) unsalted butter, at room temperature, plus more to grease the baking pan
1 1/2 cups cake flour
2 1/2 teaspoons baking powder
1 teaspoon kosher salt
1 1/2 cups whole-milk ricotta cheese
1 1/2 cups plus 1 table spoon granulated sugar
3 large eggs
1 teaspoon pure vanilla extract
1 orange, zested
2 tablespoons amaretto Confectioners' sugar, for dusting