Line a 9 inch x 13 inch pan with parchment paper, letting the parchment come up over the top of the pan.
Spray with cooking spray. Set aside.
Combine butter, marshmallows, and spice in a medium stockpot.
Heat and stir over medium-low heat until melted, about 4-5 minutes.
Immediately stir in rice krispies and vanilla.
Scrape into prepared pan.
Spread evenly and press into pan. Set aside.
Heat chocolate in a microwave safe bowl in 15 second increments, stirring well after each, until melted and smooth.
Immediately spread on top of rice krispie mixture.
Refrigerate or freeze until chocolate is set.
Using a cookie cutter, cut out shapes of houses.
Decorate as desired.