My youngsters loved my brownies which I made in the brownie-making machine, pretty similar to this one. My youngsters used to use the brownie-making machine too!
I found the really rich brownies would stick no matter what, so I made simple brownies and iced them afterwards!
I suspect this was the recipe I used.
I have no idea where it came from.
200g quality dark chocolate
1 cup caster sugar
1/2 cup cocoa powder
1/3 cup plain flour
Melt butter and chocolate in bowl, beat then whisk sugar and eggs “until white and fluffy then combine everything in the brownie-making machine, REMEMBER TO GREASE IT!
From memory they took between 8 and 10 minutes to cook.