Chocolate brownie cake without oven

INGREDIENTS
100 GRAMS BUTTER
200 GRAMS ALL PURPOSE FLOUR
200 GRAMS SUGAR
2 EGGS
1/2 TEA SPOON BAKING POWDER
ONE AND HALF TABLE SPOON COCO POWDER
PINCH OF SALT
FEW DROPS OF CHOCOLATE ESSEN
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FOR CHOCOLATE COATING
50 GRAMS DARK CHOCOLATE
50 GRAMS ICING SUGAR
1 TEA SPOON CORN FLOUR
1 TABLE SPOON BUTTER
1 TABLE SPOON COCO POWDER
ONE CUP WATER