Step 1

Preheat the oven to 350 degrees F.

Step 2

In a large bowl, mix the flour, sugar, baking powder and salt.

Step 3

In a separate mixing bowl, combine the mashed bananas, egg, melted butter and milk until incorporated.

Step 4

Stir the banana mixture into the dry ingredients just until blended (but do not over-mix as it could result in a tough muffin). Stir in the chopped Mexican chocolate.

Step 5

Divide the batter among the prepared muffin cups, filling each about 3/4 full.

Step 6

Bake the muffins until the tops are pale golden and a tester inserted into the center comes out with some melted chocolate attached but no crumbs, about 30 minutes.

Step 7

Transfer the muffins to rack to cool for 15 minutes. Then remove from the muffin tins.