Preheat oven to 350 degrees. Butter a 9-inch springform pan, line bottom with a round of parchment paper.
In a mixing bowl whisk together flour, baking powder and pink salt, set aside.
In a large mixing bowl, using an electric stand or handheld mixer cream together sugar, butter and lemon zest until well blended.
Mix in eggs one at a time and blend in vanilla.
Add in half of the flour mixture and mix until combined.
Add in ricotta and mix until combined.
Add in last half of the flour mixture and mix until combined.
Pour batter into prepared springform pan and spread into an even layer. Bake in preheated oven until cake is set (a toothpick can come out moist but no batter), about 40 - 45 minutes.
Once cool, slice and serve with a dusting of powdered sugar.