Preheat the oven to 350*F and grease a 9" round baking dish.
Sift together the flour, cornmeal, salt and baking powder in a large bowl and set aside.
Whisk the egg white until medium peaks, then add the sugar and honey and beat until combined, and there are not more grains of sugar remaining.
Combine the yogurt, butter and egg yolk until mixed well. Slowly add this to the flour until just combined.
Fold the egg white mixture into the rest of the batter until no streaks remain. Stir in the blueberries, then transfer the batter (it will be pretty thick) to the baking dish and smooth out the top.
Layer the peach slices on the top of the cake. Bake for 30-35 minutes, until the cake is browned and a cake tester comes out clean. Allow to cool slightly before serving.