Preheat the oven to 160° C.
Grease a 6 inch baking pan with some oil. Line it with a parchment sheet and brush it with some oil again. Now sprinkle about 1 tablespoon of sugar (we are using brown sugar).
Combine all dry ingredients in a bowl (flour, baking powder, baking soda, chia seeds).
In another bowl, combine all the wet ingredients (yogurt, oil, milk, vinegar and sugar).
Add half of the dry mixture to the wet mixture and fold it in. Once incorporated, fold in the rest and mix.
Lastly, fold in the lemon juice and zest.
Pour the batter in your baking dish. Bake for 15 minutes uncovered. Cover with foil and continue baking for another 8-10 minutes.
Test the cake with a skewer, if the skewer comes out clean, it’s done. If it is still wet, keep the pan inside the oven for another few minutes. Remove from the oven and let the cake cool.
Using a knife, go around the edges of the cake to loosen it up from the tin/ pan. Turn it around to remove the cake from the tin/ pan.