Preheat oven to 180°C/360°F and adjust a baking rack onto the middle shelf. Grease and dust with flour (or line with parchment paper) a 8-inch cake pan and set it aside.
In a large bowl, place the eggs and sugar. Beat the mixture with an electric whisker until light and pale, then gently whisk in the olive oil, followed by the vanilla, lemon zest, and mix until all the ingredients are combined.
3 large free-range eggs, 140 g sugar, 120 ml lightly-flavoured extra-virgin olive oil, 1 teaspoon vanilla extract
Slowly incorporate the flour into the batter, mixing until just combined. Sprinkle the baking powder over the batter and mix until just combined (do not overmix).
Fold into the batter 2 peaches cut into tiny chunks, and mix until just combined.
1 tablespoon baking powder, 600 g peaches
Pour the peach cake batter into the prepared baking pan. Top the batter with the remaining 2 peaches cut into thin slices.
Bake in the oven for approximately 30-40 minutes. To check if the cake is ready, insert a toothpick in the middle, if it comes out clean, the cake is ready.
Remove the peach cake from the oven, and lightly brush it with apricot jam. Allow to cool, then gently remove the cake from the pan.
Dust the peach cake all over with confectioner sugar and serve at room temperature.
1 tablespoon confectioner sugar