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Peel and break the banana into a large bowl and mash using a fork.
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Add the peanut butter (you can use chunky if you like but I prefer using smooth in cakes), light brown sugar, eggs, oil and gluten free self raising flour, whisk together using an electric whisk until you get a thick cake batter.
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Set your gluten free cake batter aside while you grease and line a 2lb cake tin. Pour in half the gluten free batter, then add 100g of the strawberry jam in dollops across the top of the batter. Use a skewer or knife to drag the jam through the batter to marble it slightly.
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Pour the rest of the batter on the top, and repeat with the jam as in step 3.
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Place your tin in an oven preheated to gas mark 5/190c for 45-60 minutes until well browned on the top and a skewer comes out clean. It can be hard to tell with the skewer if it is just jam coming out, if you can see peanut butter streaks it is likely to need a bit longer in the oven.
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Once cooked, allow to cool in the loaf tin, once cold it can be sliced up.

