Preheat the oven to 350 degrees and line a baking sheet with parchment paper.

Stir together the flour, pumpkin pie spice, and baking powder in a bowl.

Cream the butter and brown sugar until light, then mix in the egg yolk and vanilla.

Combine the wet and dry mixtures until a dough forms.

Scoop the dough into eight portions, shape each into a rounded ghost form, and place them on the baking sheet.

Bake for 10 to 12 minutes until the edges turn lightly golden, then let the cookies cool completely on a rack.

Melt the white chocolate chips in the microwave in short bursts, stirring until smooth.

Dip or spread the cooled cookies with the melted white chocolate to form the ghost shape, then press two mini chocolate chips into each as eyes.

Allow the chocolate to set before serving.