Beat the eggs with the sugar and add the yogurt, baking powder and oil. After mixing well, slowly pour in the flour and mix again until homogeneous.
Pour the mixture into a greased and floured cake form. Roll the grapes in a little flour and distribute them evenly. You can press some of the grapes down into the cake. Put the easy cake with grapes to bake in a preheated 356°F (180 °C) oven.
Once the cake rises and gains a crust, place a sheet of aluminum foil on it, to prevent burning. Finish baking after lowering the oven to 302°F (150 °C) until ready.
Cut the cooled cake. For decoration, you can use nuts and fresh grapes.