01 - Whisk together all-purpose flour, baking powder, and salt in a medium mixing bowl until evenly blended.
02 - In a large mixing bowl, beat unsalted butter and granulated sugar using an electric mixer until mixture is light, fluffy, and pale. Incorporate the egg and vanilla extract, then blend in orange gel food coloring for an even hue.
03 - Gradually add the dry ingredient mixture to the wet base, mixing on low speed until a soft dough forms.
04 - Divide dough into two portions, shape into disks, wrap each portion in plastic wrap, and refrigerate for 30 minutes.
05 - Set oven to 350°F (175°C) and line two baking sheets with parchment paper.
06 - On a lightly floured surface, roll dough to 1/4-inch thickness. Use a pumpkin-shaped cookie cutter to make cookies. Carve Jack-O'-Lantern faces from half the cookies using a small knife or carving tool.
07 - Arrange cookies on prepared baking sheets and bake for 10–12 minutes, or until edges are golden. Cool cookies completely on wire racks.
08 - Heat heavy cream until just simmering. Pour over chopped semi-sweet chocolate and unsalted butter. Allow mixture to sit for 2 minutes, then stir until glossy and smooth. Cool to room temperature.
09 - Spread roughly 1 teaspoon of ganache over the flat side of each un-carved cookie. Top with a face-carved cookie, pressing gently to secure.
10 - Apply black writing gel or melted dark chocolate for facial details. Attach fondant stems and leaves if desired.