Preheat oven to 350F. Grease an 8-inch round cake pan.
In a large mixing bowl, combine the flour, baking powder, salt, cinnamon and ginger. Set aside.
In a stand mixer, whisk eggs and sugar until light and fluffy, about 5 minutes. Add butter, and continue whisking to combine.
In a separate bowl, mix together yogurt, lemon zest, juice and vanilla. Set aside.
With the mixer on low speed, add half of the flour mixture. Once combined, add the yogurt mixture, mix until just blended. Slowly add the remaining flour mixture, scraping down sides of the bowl with a spatula, as necessary, until just blended.
Pour the cake mixture into the prepared cake pan. Arrange the apple slices on top of the cake. Bake for 35 to 40 minutes or until a toothpick inserted in the center comes out clean.
Remove the cake from the oven. Serve warm or at room temperature.