Preheat the oven to 350°F (175°C) and line a muffin tin with paper liners.

In a large bowl, whisk together the flour, baking powder, ginger, cinnamon, and brown sugar.

In another bowl, combine the molasses, eggs, milk, and melted butter until smooth.

Pour the wet ingredients into the dry ingredients and stir gently until just combined.

Spoon the batter into muffin cups and bake for 18-20 minutes or until a toothpick comes out clean.

Allow muffins to cool completely before preparing the icing by beating the cream cheese with powdered sugar until fluffy. Spread over each muffin.