1Beat butter and brown sugar with an electric mixer of medium-high speed until fluffy. 3 to 4. Add egg: mix well. Beat in molasses, cinnamon, ginger, allspice, baking soda, and salt. Reduce speed to low, and add flour. 1 cup at a time, mixing just until incorporated. Divide dough into quarters: shape into disks. Wrap each well in plastic; chill 3 hours or up to 1 day.
2Preheat oven to 375 degree Fahrenheit. On a lightly floured work surface, roll out 1 disk of dough to 1/8 inch thickness. Cut out shapes using gingerbread-people cutters and place on parchment-lined baking sheets, spacing 1 inch apart. Repeat with remaining dough; roll out scraps as needed. Cut out mini hearts from scraps using a tiny cookie or aspic cutter. Place hearts on shapes, and chill 20 minutes.
3Bake 2 sheets at a time, rotating halfway through until cookies are firm to the touch, 12 to 15 minutes. Let cool on sheets 5 minutes, then transfer cookies to wire racks to cool completely.
1Add vanilla flavoring into 1/2 cup water and set aside until step 3.
2In the mixer (paddle attachment), gently mix confectioners sugar and meringue powder on low.
3Add 1/2 cup flavored water and mix on low until it is thick and lumpy.
4Now drizzle the remaining water as needed until it becomes a thick like honey consistency.
5At this point, turn mixer on medium speed for 3 minutes or so until icing is thick and fluffy. Stop when it forms a soft peak.
1Using a piping bag, decorate each cookie with royal icing. Add Fancy sprinkles where desired. On the gingerbread mens' outfits, use edible markers to write any cute slogans you'd like.