Preheat the oven to 170 degrees Celsius. Grease a pan with oil and dust it with flour; tap the pan to release the excess flour. A square or rectangular pan is ideal to cut into bars, but a round pan will also work.

Put wheat flour, sugar, oats, cocoa and baking soda in a bowl and mix well.

Pour in the vanilla and oil, followed by the yogurt and mix well.

Add the sugar and mix well. Pour this batter into the greased and floured pan.

Bake at 170 degrees Celsius for 35 minutes till a tooth pick comes out clean.

Allow the brownie cake to cool down completely before cutting it into squares.