Beat up the sugar n butter until creamy ... add 1 egg at a time...beat further until smooth. Mix together all the dry ingredients n set aside.Add mashed banana n yogurt n vanilla to the egg mixture n beat til blended...take the beater off...fold in the dry ingredients gently with a spatula or scrapper ( not all at a time)...if the raspberries r big, cut into half n toss them with 1 tbsp of flour....lastly very gently fold in the chocolate or caramel n raspberries. Dnt over mix. ..Transfer to a greased baking pan...Top it with some chunks n raspberries. ..bake in a preheated oven for about 50 to 55 mins at 190 °c.