Preheat your oven to 400°F (200°C) and line a muffin tin with muffin liners.
Place sugar and butter in a large bowl and mix until fluffy.
Add the eggs and mix well.
In a separate bowl, mix together flour and baking powder. Then add it to the egg, butter & sugar mixture and mix just enough for it to be well blended.
Add milk, vanilla extract and lemon zest, and mix until smooth.
Scoop batter into muffin liners. Don't fill them more than ¾ of the way as they will rise.
Place the muffins in the middle of the oven and bake for 16-20 minutes. Test with a cake tester or tooth pick – it should come out with no or very little cake batter when they are done. Enjoy!
