Try this Easy Brownies recipe, or contribute your own.
Why did the center sink while the edges overbake? Achieving a dense crumb relies entirely on thermal control during the initial melting phase and rigorous mechanical action later.
Adjusting this formulation requires caution because altering the ratio of sugar to fat changes the internal structure significantly. Scaling quantities upward demands a larger baking vessel to maintain the precise depth needed for a fudgy interior.