Prep. Preheat the oven to 325°F. Grease a 9x5 inch loaf pan and line it with parchment paper.
Warm the milk. Gently warm the milk without letting it boil. Stir in the baking soda and set aside.
Cream. In a large bowl, beat the softened butter and brown sugar until light and smooth.
Add the wet ingredients. Beat in the egg, then mix in the molasses until fully combined.
Mix the dry ingredients. In a separate bowl, whisk together the flour, ginger, cinnamon, nutmeg and salt.
Combine. Add the dry ingredients to the butter mixture a little at a time, alternating with the milk mixture. Mix gently just until combined. Do not overmix.
Bake. Pour the batter into the prepared pan and smooth the top. Bake for 55 to 60 minutes, until a skewer inserted in the center comes out clean.
Cool. Cool in the pan for 10 to 15 minutes, then transfer to a wire rack to cool completely before slicing.