Preheat oven to 400°F (200°C).

In a large bowl, mix together flour, baking powder, cinnamon, and salt.

In a separate bowl, combine cereal and milk and let stand for 3 minutes to soften the cereal.

Stir in the egg, brown sugar, and oil into the cereal mixture.

Add the cereal mixture to the flour mixture and stir just until moistened. The batter will be lumpy.

Stir in the chopped chocolate chunks.

Grease a muffin pan or line it with paper liners.

Spoon the batter into the muffin cups, filling each cup 2/3 full.

Bake for 20 minutes, or until a toothpick inserted into the center comes out clean.

Let the muffins cool slightly before serving.