Here's our favourite chocolate brownie recipe. It's nut and soya free. I Googled chocolate brownies without using chocolate years ago and this is the one I chose. I don't know where I got it from and I've changed it slightly as it uses a lot of sugar.
Makes approximately 30 shallow brownies or 16 deep ones. I use an 8 inch square pyrex ti cook them in.
225g melted butter
300g caster sugar
60g cocoa powder
225g plain flour
1/2 teaspoon of baking powder
1 teaspoon of vanilla extract
Mix it all up with blender and cook at gas mark 4 for about 25 minutes.
I have made these with only 2 eggs and they still worked, they were stickier in the middle and made a lovely hot pudding with ice cream.
Less cocoa makes them less chocolaty.
You could add nuts or chocolate chips if you wanted to.