Prepare the Batter : Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking pan. In a large mixing bowl, combine the yellow cake mix, lemon pudding mix, eggs, oil, water, and vanilla extract. Use an electric mixer to blend the ingredients until smooth, about 2–3 minutes.

Bake the Cake : Pour the batter into the prepared pan and smooth the top. Bake for 35–40 minutes, or until a toothpick inserted in the center comes out clean. Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Make the Glaze : In a small saucepan over low heat, melt the butter. Stir in the lemon juice, heavy whipping cream, and confectioners’ sugar until smooth. Remove from heat and let it cool slightly.

Glaze the Cake : Using a skewer or fork, poke small holes all over the cake. Pour the glaze evenly over the surface, allowing it to seep into the cake for extra moisture and flavor.

Serve and Enjoy : Once the glaze sets, slice the cake into squares and serve. Garnish with a dusting of confectioners’ sugar or a twist of lemon zest for a decorative touch.