In a large bowl, combine the softened butter and sugar together and beat/mix until creamy.

Add the eggs and continue mixing; then add the essence or flavor of choice.Mix thoroughly.

Gradually sift in the flour& baking powder, mix and add the milk/water, bit by bit,and continue mixing until you get a light consistency, with no lumps.

Now, prepare the sandwich toaster by brushing the insides with melted butter or oil. Close it and preheat for 3 minutes.

Then scoop in the cake batter into each of the four wells of the sandwich toaster/maker. 
Tip: if you wa

If you want a cake with the shape of toast bread, then fill the sandwich maker to the square mark, but for a smaller triangular cake, fill only the smaller triangular wells.