Banana Nutella Muffins

If you don't have a muffin tin, double up the paper cases so they stay stable.

The riper the banana, the more aromatic and sweeter the muffins will be.

Mix the baking soda evenly into the flour to avoid bitter pockets later.

If the Nutella is very firm, warm it briefly to room temperature so it’s easier to work into the batter.

Don't overmix, otherwise the muffins will be compact rather than light.

Fill the cases only about two-thirds full so nothing overflows; start the skewer test at minute 20.

For decorating, a dollop of Nutella, chocolate sprinkles or a few banana slices work well (add banana slices just before serving so they don't brown).