Preheat your oven to 350 degrees Fahrenheit.
Combine all your dry ingredients - flour, baking powder, baking soda and salt in a medium sized bowl, give it a whisk and set aside.
Add the butter and sugar into a large bowl and beat together until light in color and fluffy, about 3-5 minutes.
Add the eggs one at a time, then scrape the bowl making sure ingredients are mixed well.
Add 1/2 the dry ingredients, then add the combined lemon juice and milk to the batter. Finally add the last half of the dry ingredients and mix until just combined.
Pour batter into a greased 6-inch cake pan and bake for 28-35 minutes. For a shorter cake, you can bake the batter in an 8-inch cake pan for 25-28 minutes. Make sure to check that the cake is fully baked with a toothpick before removing from the oven and allowing to cool completely before assembling.