Preheat the oven to 350°F (or 325°F if using a dark pan). Grease and line a loaf pan with parchment paper. Leave extra paper on the sides for easy lifting later. This step prevents sticking and helps with clean removal.
Separate the biscuit dough into halves so you have 16 pieces. In a bowl, mix sugar, lemon zest, and poppy seeds together. Stir well so the flavor spreads evenly through every bite.
Melt the butter and brush each biscuit piece generously. Roll each piece in the lemon sugar mixture until fully coated. This step adds sweetness and helps create a lightly crisp exterior.
Place the coated biscuit pieces upright in the prepared loaf pan. Arrange them loosely so they can expand while baking. Sprinkle any remaining sugar mixture over the top for extra flavor.
Bake for 30–45 minutes until the top is golden brown. If the bread browns too quickly, cover loosely with foil. The center should be fully cooked and soft.
While the bread cools slightly, mix powdered sugar, softened cream cheese, butter, and lemon juice. Whisk until smooth and creamy. Adjust with a little more juice if needed for drizzling consistency.
Lift the bread out using the parchment paper. Drizzle the glaze generously over the warm loaf. Serve immediately while slightly warm for the best texture and flavor.