Preheat oven at 180 C.
Grease an 8 inch round cake tin. If using silicon pan, no need to grease it.
In a bowl, whisk the oil, yogurt, milk, sugar and jam.
In another big bowl, sieve the flour, baking powder, baking soda and salt. Make a well. Add the whisked wet ingredients. Fold until they come together. Over enthusiastic beating / whisking is better avoided.
Towards the end, fold in chopped berries.
Scrape the batter into the greased tin / silicone mould and bake at 180 C for around 45-55 minutes, checking with a tester if it comes out clean.
After 10 minutes, unmould and cool on a wire rack.
Cut into wedges, dust with icing sugar and serve with tea.