Ingredients:
– 1 cup unsalted butter, softened 
– 1 cup granulated sugar 
– 4 large eggs 
– 1 teaspoon vanilla extract 
– 2 cups all-purpose flour 
– 1/2 teaspoon baking powder 
– 1/4 teaspoon salt 
– 1/2 cup milk 
– Zest of 2 lemons 
– 1/4 cup freshly squeezed lemon juice
Preparation:
1. Preheat the oven: Set your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan or line it with parchment paper. 
2. Cream the butter and sugar: In a large bowl, beat together the softened butter and granulated sugar until light and fluffy.
3. Add eggs and vanilla: Mix in the eggs, one at a time, followed by the vanilla extract.
4. Combine dry ingredients: In a separate bowl, whisk together the flour, baking powder, and salt.
5. Mix the batter: Gradually add the dry ingredients to the butter mixture, alternating with the milk. Stir in the lemon zest and lemon juice until combined.
6. Bake: Pour the batter into the prepared cake pan and smooth the top. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
7. Cool and serve: Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. Enjoy your lemon butter cake! 
This Lemon Butter Cake is light, fluffy, and packed with bright lemon flavor!