Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a square baking pan and line it with parchment paper.

Prepare the Batter: In a bowl, cream the butter and sugar together until light and fluffy. Beat in the eggs one at a time, mixing well after each addition. Stir in the lemon zest and lemon juice.

Combine Dry Ingredients: In another bowl, whisk together the flour, baking powder, and salt.

Mix Ingredients: Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Mix until just combined. Stir in the vanilla extract.

Bake the Cake: Pour the batter into the prepared baking pan and smooth the top. Bake in the preheated oven for about 20-25 minutes, or until a toothpick inserted into the center comes out clean.

Prepare the Glaze: While the cake is baking, mix the powdered sugar and lemon juice in a small bowl until smooth.

Drizzle with Glaze: Once the cake is done, let it cool in the pan for about 10 minutes. Remove the cake from the pan and place it on a wire rack. Drizzle the prepared lemon glaze over the warm cake bites. Optionally, sprinkle with additional lemon zest for garnish.

Serving: Cut the cake into bite-sized pieces and serve.