Peel the bananas and put them in a foil parcel with a tablespoon of the rum. Put them in the oven and bake at 180c for 15 minutes. Remove them from the oven and turn the heat of your oven to 200c.
Mash the bananas and stir in the remaining rum.
Break the chocolate into small chunks and add the butter and coconut oil. Soften in the microwave or over a bain mairie
Stir the banana mixture into the flour and cocoa powder and mix well. Add more milk as necessary to get a 'dropping' consistency.
Use an electric hand mixer to blend all the sugar into the chocolate, butter and oil, till very smooth.
Beat the eggs into the chocolate mixture one by one
Sift the flour, baking powder and salt together
Fold the flour mix into the chocolate, then gently stir through the rum and banana mixture
Line a 9 inch square brownie pan with silicon baking paper
Pour in the mixture and place in the oven for 25=35 minutes or until the top is just starting to crack
Take the brownies out and leave in the tin for 5 minutes, before marking out squares (I made 16 brownies) and turning out onto a wire rack
Once cool, place in an airtight tin or freeze immediately
I like these zapped in the microwave for 30 seconds and served with a good dollop of cream