Mum's Fudgy Chocolate Brownies

Hand written recipes. Passed down from generation to generation.
The exact same flavours, textures and appearance experienced by those carrying the same genes, decades apart. There's something exquisite in the thought of family traditions, things enjoyed on repeat-those delightful family classics.
This is one of those family classics. It's mum's brownie recipe, and it's a real winner. I've tried other brownie recipes and I just can't find one quite as nice. It's fudgy, chocolatey and moist-simply delectable. Today my kids are making it and it's being enjoyed my the third generation. I hope it passes to many more!
What's your best family favourite?

MUM'S BROWNIES

1 cup (250g) butter
1 cup cocoa powder
2 cup brown sugar, firmly packed
4 eggs
1 tsp. vanilla
1 cup plain flour
1/2 tsp salt


Icing:
1/3 cup cocoa powder
2 tbsp butter, melted
1/4 cup (60ml) cream 
2 cups icing sugar
1 tsp vanilla essence
Walnuts to decorate (optional)

Preheat your oven to 180C.
Melt butter and remove from heat. Stir through the cocoa and brown sugar until combined.
Beat in the eggs and vanilla. Next, blend in the flour and salt. Spoon the batter into a greased and lined 18x18 square baking dish. Bake for 15-20 minutes. Remove from heat and set aside to cool.

To make the icing, place all the ingredients in a bowl, and whip on high until thick and smooth. Cut the edges off the cooled brownie, then cut into two. Lather one with icing, then place the other half on top and smooth on the remainder. You can use a fork to draw a line pattern in the top, and sprinkle crushed walnuts on the finished product if desired. Cut and serve!

NOTES: You can omit a tablespoon or so of the flour to make for a slightly fudgier brownie. Yum!