11. Preheat oven to 350°F. Grease a 9x5-inch loaf pan with butter, then dust with flour.
22. Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
33. In a large mixing bowl, beat sugar and eggs until pale and fluffy, about 3 minutes. Slowly incorporate sour cream, vegetable oil, lemon zest, and lemon juice until completely smooth.
44. Gradually fold dry ingredients into wet mixture, stirring until just combined. Avoid overmixing to maintain tender crumb.
55. Pour batter into prepared loaf pan. Smooth top with a rubber spatula.
66. Bake until a toothpick inserted in center comes out clean, 45-50 minutes.
77. Cool in pan for 10 minutes, then transfer to wire rack.
88. Prepare glaze by whisking powdered sugar, lemon juice, and zest until smooth.
99. Drizzle glaze over completely cooled loaf, allowing it to cascade down sides.