When are blueberry muffins ready?

Blueberry muffins are ready when a toothpick inserted into the center of a muffin comes out clean, and the muffin is golden brown on top. The baking time can vary depending on the muffin recipe and oven, but it typically takes around 20-25 minutes. To ensure the muffins are cooked through, check them after 18 minutes and then every few minutes until a toothpick inserted into the center comes out clean.