Preheat your oven to 180°C (350°F). Grease and line a cake tin (approximately 20 cm in diameter) with parchment paper.
In a large mixing bowl, beat the softened butter and caster sugar together until light and fluffy. This should take about 3-5 minutes.
Add the eggs one at a time, beating well after each addition. Mix in the vanilla essence.
In a separate bowl, sift together the all-purpose flour and baking powder.
Gradually add the dry ingredients to the butter mixture, mixing until just combined. Be careful not to overmix.
Pour the batter into the prepared cake tin, smoothing the top with a spatula.
Bake in the preheated oven for 45-50 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool in the tin for 10 minutes before transferring it to a wire rack to cool completely.
Once cooled, slice and enjoy this delightful butter cake. It pairs perfectly with a cup of tea or coffee.
