Preheat the oven at 180C/350F and grease an ovenproof dish (25-28cm).
In a large bowl mix the dry ingredients (flours, oat bran, salt, baking powder, chia/poppy seeds and the soda bicarbonate which was mixed with the vinegar).
With the help of a mixer mix the butter with the sugar and the eggs for 2-3 minutes. Add the ricotta cheese, the yoghurt and mix well for another minute until it is all nicely incorporated.
Fold the flour mixture into the eggs mixture until it is all nicely mixed up. It should be a soft dough and not a runny one. Put the berries in and mix.
Slice the peaches, and put them aside for a minute.
Put the dough into the greased oven dish and spread evenly. Arrange the peach slices on top of the dough flesh down skin up.
Place in the oven and bake for 40-45 min till nice n' golden.
Notes
If you wish the cake slightly sweeter, sprinkle 2 tablespoon of unrefined sugar on top. Also, the yoghurt can be replaced by double cream if you want to indulge a little more. Why not, it's a cake at the end of the day!