Place the rack in the middle position and preheat the oven to 180 °C (350 °F).
Line the bottom of one spring-form baking pan with parchment paper. Don't put butter on the sides, this way your cake will raise nicely.
Before mixing the eggs, it's time to sifted the flour and the baking powder together, place them into a bowl and set aside.
Beat the eggs for about 5 - 10 minutes, add the sugar, the finely chopped basil, and the lemons zest until the mixture is light and fluffy. You should mix it for about 10 minutes for the best results.
The mixture will be light yellow in color and will have doubled in height in the bowl. After 10 minutes fold in the melted butter using a spatula or a wooden spoon. When the butter is well incorporated add the sifted flour and baking powder and delicately folded in with a wooden spoon.
Pour the batter into the springform baking pan. Bake for about 30 minutes or until a toothpick inserted in the center of the cake comes out clean.
Lemon Cream Cheese Sauce
Keep the sauce into the refrigerator until serving.