Beat 2/3 cup sugar and margarine at medium speed of a mixer until well-blended.
Add molasses and egg; beat well.
Combine flour, baking soda, ginger, cinnamon, and mace; gradually add to sugar mixture. Stir until well-blended. Divide in half. Wrap each portion in plastic wrap; freeze for 30 minutes.
Shape each portion of dough into 26 (1-inch) balls; roll in 3 tablespoons sugar.
Place, 2 inches apart, on baking sheets coated with cooking spray.
Bake at 350 for 12 minutes or until lightly browned.
Remove from sheets; let cool on wire racks. Store in an airtight container.