Always use high-quality ingredients like cocoa powder, choco chips or chunks, fresh eggs, and butter.

It is essential to use a kitchen scale for precise measurements of flour, cocoa powder, and sugar.

It is advisable to use all the ingredients at room temperature. Such ingredients blend more easily.

Overmixing can lead to tough and dense muffins. Mix wet and dry ingredients until they are combined. 

To prevent muffins from sticking, grease the muffin tin properly or use good-quality paper liners.

It is essential to keep a close eye on your muffins while they bake. Overbaking can lead to dry muffins.