Preheat oven to 350 F. Line a loaf pan with parchment paper and spray with nonstick spray.
In a large bowl combine eggs, milk, vanilla extract, melted or softened butter with sugar until smooth.
Add in lemon zest, flour, baking powder, poppy seeds and salt to batter and gently stir until batter is combined. Do not over mix, batter lumps are okay.
Pour half of batter into a prepared loaf tin, smooth the top. Drizzle lemon curd and swirl into the batter, top with the remaining half and bake lemon loaf for 50-60 minutes or until a tooth pick comes out clean.
Allow lemon loaf to cool for 10-20 minutes before transferring to a wire rack and slicing.