Buttery Apple Torte Cake Recipe

In a microwave, melt the butter. Pour 6 Tb of it into a small bowl or cup and set aside. Add the apple slices and the remaining butter to a large frying pan and cook on low heat, stirring occasionally, until the apples are tender, about 10 minutes. Remove from the heat.
In a small bowl, stir together the flour, baking powder, and salt. In a large bowl, beat the whole eggs and egg yolk until blended. Add the 6 Tb of melted butter, the vanilla, the granulated sugar, and the lemon zest. Stir in the flour mixture and the apples. Spoon into the prepared pan, smoothing the top.
Bake until browned. Transfer to a wire rack and let cool in the pan for 5 minutes. Invert the cake onto a plate and lift off the pan, then invert the cake again onto the rack and let cool completely.

Just before serving, dust the top of the cake with confectioners' sugar.