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Melt butter over low heat and set aside to cool down.
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Whisk eggs, sugar and vanilla extract in a bowl.
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Add the cooled melted butter, cooking oil and mix well.
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Peel ripe bananas and mash coarsely.
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Add the egg butter mixture to the mashed bananas and mix well.
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In a separate bowl, add flour, baking powder, baking soda and salt. Whisk dry ingredients..
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Add wet mixture to dry mixture and stir until everything is well mixed.
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Divide batter equally into two bowls.
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Add the semi sweet chocolate chips and mix well.
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Lightly oil or line with baking paper, two loaf pans (8 X 4 ins each) and scoop batter into the pans.
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Top with sliced bananas (optional).
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Bake in a preheated oven at 175 C for about 20 minutes on the middle rack.
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Reduce temperature to 160 C and bake for another 20 to 30 minutes on the lower rack.
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If you find top of cake turning too brown, cover the top with parchment paper. Test cake with a skewer. It is fully baked when the skewer comes out clean.
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Leave both pans to cool down before unmoulding the cakes.
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Remove cake from pan by running a spatula round the sides and overturning the pan to unmould.
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Leave cakes on the cooling rack before cutting.