I converted this brownie recipe tonight and the result was very nice so thought I'd share
http://hearty-food.co.uk/2013/05/13/ultra-gooey-chocolate-beetroot-brownies/Ingredients
200g unsalted butter
250g good quality dark chocolate
200g golden caster sugar (I used normal)
3 eggs
60g plain flour
30g cocoa powder
Half tsp baking powder
Pinch of sea salt
300g cooked beetroot (I peeled and cut into chunks then microwaved for 12 minutes).
1. Preheat the oven to 180C/350/gas mark 4. Grease and line a 20cm x 20cm tin.
2. Melt butter and chocolate 50 degrees/speed 3/3mins or until melted. I stopped and scraped the sides once or twice.
3. Add flour, sugar, cocoa powder, eggs, salt and beetroot and mix speed 6 for 30 seconds stopping once to scrape down sides until all combined.
4. Add baking powder and mix on speed 4 for 5 seconds.
5. Pour batter into tin and bake for 25-30 mins. Test by pressing the top. It should feel crispy with a bit of give underneath. If too soft return to the oven for a few more minutes. If you insert a skewer there should be a few moist crumbs stuck to the skewer. Mine took the full thirty minutes.
6. Allow to cool for ten mins in the pan before cooling on a rack.