'1 cup plain drained yogurt or Greek yogurt (not nonfat)'
'1/4 cup honey'
'1/2 teaspoon vanilla extract'
'1 cup heavy cream'
'whipped to firm peaks'
Preheat an oven to 350°F
Butter the bottom and sides of a 9-inch round cake pan with 2-inch sides
Line the bottom with parchment paper and dust the sides with flour, shaking out the excess
Sift together the flour and baking powder in a bowl
In a bowl, whisk together the yogurt, oil, zest, vanilla, and salt
In a stand mixer fitted with a whip, beat the eggs on medium speed until frothy and well blended
Add the sugar gradually
Raise the speed to medium-high and whip until the sugar dissolves and the mixture is thick and pale, stopping the machine to scrape down the sides of the bowl at least once
Lower the mixer speed and add the yogurt mixture gradually
Add the dry ingredients gradually and beat just until well blended
Pour the batter into the prepared cake pan, spreading it evenly
Bake on a center rack until the surface is golden brown and firm to the touch and a toothpick comes out clean, about 40 minutes
Cool on a rack for 10 minutes, and then unmold and finish cooling, top side up, on the rack
To make the yogurt cream: In a bowl, whisk together the yogurt, honey, and vanilla
Gently fold in the whipped cream
Slice the cake into wedges to serve, topping each portion with a dollop of the yogurt cream, if desired