A thin shiny brownie crust is linked to dissolved sugar and the way the egg-and-sugar mixture sets during baking. It is a surface texture, not a guaranteed sign that the center is done.
Dissolve sugar properly
Recipes that combine warm fat with sugar or beat sugar and eggs can help create an even surface. Undissolved granules and different sugar types may give a rougher finish.
Mix according to the recipe
Some formulas call for vigorous egg-and-sugar mixing, while others fold ingredients gently. Respect the sequence because fat, chocolate and sugar interact differently from recipe to recipe.
Judge doneness separately
A shiny top can form while the center still contains wet batter. Check for set edges and moist crumbs, then allow the brownies to cool before slicing.
Frequently asked questions
Do dull-topped brownies taste bad?
Not necessarily. A matte top can still cover delicious, properly baked brownies, especially in recipes with different fat or sugar ratios.
Related: why bloom cocoa powder in melted butter.
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