Try this Banana Chip Muffins recipe
Overmixing is the single most frequent cause of tough, rubbery baked goods. Stirring muffin batter until completely smooth develops gluten networks in the all-purpose flour, transforming a tender crumb into something resembling chewy bread. Whisking dry components like flour, sugar, baking powder, salt, and chocolate chips together first distributes the leavening agents evenly. Beating the egg separately incorporates air, which helps the dense banana purée lift properly during baking. Pouring wet ingredients into a central well allows for quick incorporation with minimal strokes, ensuring the final mixture remains properly lumpy.
Hot ovens are necessary for proper chemical leavening activation. Setting the oven to 400 degrees Fahrenheit creates immediate thermal shock, causing carbon dioxide from the baking powder to expand rapidly and push the batter upward into characteristic domed tops. Greasing muffin cups thoroughly prevents sticking, allowing the batter to climb the edges without obstruction. Filling each cup three-quarters full provides adequate room for expansion without spilling over the rim.