Preheat the oven to 325 degrees F. Spray an 8x5 or 9x5-inch loaf pan with nonstick spray.
In a large bowl, use an electric mixer to combine the butter and sugar until light and fluffy. Add the milk, eggs, lemon extract and lemon zest; beat well. Mix in the dry ingredients and beat just until combined. Stir in the poppy seeds.
Scrape the batter into the prepared loaf pan and bake for 50 minutes, or until a toothpick inserted into the center comes out clean. Let the bread cool for about 1/2 hour before removing it to a wire rack to cool completely.
ADD THE GLAZE:
In a medium bowl, whisk together the powdered sugar and enough lemon juice to create a thick glaze. Place the bread on a wire rack with a piece of wax paper underneath. Pour the glaze over the top of the bread and let it run down the sides of the loaf. Let it sit until the glaze firms up. Slice and enjoy.