Preheat and prepare pan. Position a rack in the center of your oven and preheat the oven to 350°F (177°C). Spray a 8x4” loaf pan with cooking spray, or line with parchment paper and then spray with cooking spray.
Combine dry ingredients. Whisk together the the all-purpose flour, sugar, baking powder, and salt. Set aside. 1 cup (200 g) granulated sugar 2 cups (240 g) all purpose flour 1 Tablespoon baking powder ½ teaspoon salt
Combine wet ingredients. In a second mixing bowl, whisk together eggs, oil, sour cream, vanilla, lemon zest and lemon juice until combined. 2 large eggs ½ cup (120 ml) neutral-tasting oil ⅔ cup (160 g) sour cream ½ teaspoon vanilla extract ¼ cup (60 ml) lemon juice 2 Tablespoons lemon zest
Combine wet and dry ingredients. Add the dry ingredients to the wet ingredients and mix together with a spatula or wooden spoon just until just combined. Do not overmix.
Bake. Spoon batter into prepared loaf pan. Bake in a preheated 350oF (177oC) oven for 50-55 minutes until a toothpick inserted into the middle of bread comes out clean or with a few moist crumbs clinging to it (no wet batter) and top springs back to the touch when lightly touched. Remove from the oven and cool completely in the pan on a wire cooling rack.
Make the glaze. In a small bowl whisk together the powdered sugar and lemon juice. Drizzle over the cooled bread. Slice and serve.