Here’s what you’ll need to make the bars: – ½ cup (1 stick) salted butter, melted – 1 ¼ cup white sugar – 2 eggs – 1 lemon (juiced and zested with the juice divided for the glaze) – 2 tsp vanilla extract – 1 1/4 cup all purpose flour – 1 tablespoon poppy seeds – ½ tablespoon cornstarch – ½ teaspoon baking powder Here are the ingredients you’ll need for the glaze: – 1 cup powdered sugar – ½  tablespoon lemon juice – 1-2 tablespoons milk