The Egg Hack That Transforms Homemade Cinnamon Raisin Bread - Tasting Table
Briefly

Cinnamon raisin bread often has structural issues, causing it to unroll or feature gaps when sliced. Using melted butter as a filling binder can exacerbate this problem.
Being aware of the differences in texture preference is crucial; butter adds great flavor for decadent rolls, while an egg wash is better for a stable loaf.
When swapping butter for an egg wash, it acts as a binding agent due to its high protein content, helping to seal the dough layers.
For those who appreciate a pull-apart texture, butter works well in recipes aimed at creating gooey rolls, but may not be suitable for stable loaves.
Read at Tasting Table
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