Why would muffins taste like rubber?

Muffins can taste like rubber due to overmixing the batter, which develops too much gluten, resulting in a dense and chewy texture. Additionally, using too much baking powder or baking soda can create an off-flavor and affect the texture. Baking at too high a temperature can also lead to a dry and rubbery outcome. Lastly, using low-quality ingredients, such as expired flour or stale baking powder, can negatively impact the flavor and texture.