Preheat Oven: Set your oven to 350°F (175°C).
Prepare the Bundt Pan: Thoroughly grease and flour a 12-cup Bundt pan to ensure easy release.
Mix Dry Ingredients: In a medium bowl, whisk together the cake flour, baking powder, baking soda, and salt. Set aside.
Cream Butter and Sugar: In a large mixing bowl, using an electric mixer, beat the softened butter and granulated sugar until light and fluffy, about 3–4 minutes.
Add Eggs: Add the eggs one at a time, beating well after each addition.
Incorporate Dry Ingredients and Buttermilk: Alternately add the dry ingredient mixture and buttermilk to the batter, beginning and ending with the dry ingredients. Mix until just combined.
Add Flavorings: Gently fold in the lemon zest, lemon juice, and vanilla extract until evenly distributed.
Bake: Pour the batter into the prepared Bundt pan and smooth the top. Bake for 50–60 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Remove the cake from the oven and allow it to cool in the pan for 10–15 minutes. Then, invert the cake onto a wire rack to cool completely.
Prepare Lemon Glaze: In a small bowl, whisk together the powdered sugar, lemon juice, and lemon zest until smooth. Adjust the consistency as needed by adding more lemon juice or powdered sugar.
Glaze the Cake: Once the cake is completely cooled, drizzle the lemon glaze over the top, allowing it to cascade down the sides.