In a mixing bowl, mix together the cooled melted butter, both sugar and molasses. Stir until blended, then stir in the egg.
Whisk the flour baking soda, salt and spices together in a bowl and add to the egg mixture.
Stir to make a soft dough. Cover bowl and chill for 2 hours. If you used cool butter, you may be able to scoop it now, but the dough balls might spread a little more during baking.
Preheat oven to 350 degrees.
Scoop dough with a small cookie scoop or use rounded teaspoons. You should be able to scoop out at least 32 little balls.
Arrange on parchment lined baking sheet and bake one sheet at a time for about 10 to 12 minutes.
Let the cookies cool on the baking sheets for about 3 minutes, then transfer to a wire rack to finish cooling.