Prep the Pan: Grease and line your cake pan to prevent sticking.
Mix Dry Ingredients: Combine flour, baking powder, baking soda, salt, and poppy seeds in a bowl.
Cream Butter and Sugar: Beat until fluffy to incorporate air for a light cake.
Add Eggs and Flavorings: Incorporate eggs one at a time, then add vanilla and lemon zest for fragrance.
Combine Dry and Wet: Alternate adding flour mixture and buttermilk for a smooth, even batter.
Add Lemon Juice: Stir gently, enhancing moisture and lemon flavor.
Bake: Bake at 350°F for about 50–60 minutes. Check doneness with a toothpick.
Cool Cake: Let cake rest, then remove from pan to prevent sogginess.
Make Glaze: Whisk powdered sugar with lemon juice and zest until pourable.
Glaze Cake: Drizzle and let it set before slicing.