Very Easy 1-Bowl Brownie (Cakey)

My favourite type of recipe ... just mix everything in 1 bowl by hand! Notice the crackly top which distinguishes this as a brownie (and not a cake).  The secret is to melt butter and sugar together at the start, which will somehow cause this thin "meringue" layer to form.

A)
1/4 C (55g) butter
3/4 C sugar

1/2 C semi-sweet chocolate chips

1/4 C corn oil 
1/2 C Hershey's cocoa


B)
1tsp vanilla essence
1/2 tsp of coffee melted in 1 tsp hot water (optional)
1 tsp baking powder
2 - 3 eggs (more eggs = softer & more "cakey" brownie)

C)
3/4 C plain flour
3/4 tsp bicarbonate of soda
1/4 tsp salt

D) Optional but highly recommended
1/2 C chopped walnuts
1/2 C semi-sweet chocolate chips

Method
Pre-heat oven to 180 C. Line a 7" x 11"tin or similar with silicon paper.
In a microwave-safe mixing bowl, mix sugar and butter.  Microwave on High (2 or 3 times of 30 secs till bubbling). Cover to prevent splatters.
Stir in the rest of (A) till chocolate chips are dissolved (can speed up by microwaving).

Stir the mixture till a little cooler ... to prevent eggs scrambling when they are added!

Whisk in Ingredients (B) till eggs are well-mixed in.
Whisk in Ingredients (C)
Stir in Ingredients (D)

Pour into prepared pan and smooth the batter evenly.
Bake for 18 mins.  Cool in the pan before slicing into bars.