Grease the Ramekin moulds/mugs with oil.
If using an open pot or pressure cooker, add enough water and keep it for boiling.
In a small bowl add chia seeds and lukewarm water.
Mix it and let it rest for 10 minutes.
In the meantime, in a large bowl sift in the flour, cocoa powder, and baking powder.
Add in the oats and sugar and mix everything.
If adding Almonds, add it now to the mix.
Once the chia seeds are swelled up and they form a gel-like structure continue with the next step.
In the same bowl add the mashed bananas, oil, milk, chia seeds mix and milk.
Form a lump free batter
Fill in the ramekin moulds/mugs to 3/4
If you are making different variety of mug cakes, fill the moulds/mugs only half with the batter.
Now top it with your toppings and mix.
Cover the moulds/mugs lightly with an aluminium foil. Press it down on the edges. Be sure that the foil should not touch the water. Covering helps the water not get inside the cakes.