Yogurt and lemon cake

Ingredients :

1 sachet of baking powder
3 pots of flour
1 pot of sugar (adjust according to your preference)
100 g of melted butter (or 1 pot of oil)
3 eggs
1 plain yogurt (use the yogurt pot as a measure)
Grated zest and juice of a fresh untreated lemon
Preparation:

Pour the batter into a previously buttered and floured mold to prevent the cake from sticking. Level the surface of the batter in the mold.