These festive Halloween Rice Krispie Treats are perfect for parties, treat bags, and after-school snacking. Start with a basic recipe and customize them with frosting and candy to create your favorite characters.
Butter a 9-inch by 13-inch baking dish. In a large stockpot or Dutch oven (at least 5 quarts) over medium heat, add butter and cook until melted, about 3 minutes.
Continue cooking butter, stirring constantly, until the milk solids turn golden and the butter darkens slightly, about 5 to 7 minutes longer. Do not walk away as you want the butter to brown, not burn and turn black.
Reduce heat to medium low and add marshmallows to the pot. Stir until the marshmallows have melted into the butter completely and the mixture is smooth, about 5 to 7 minutes (aim for a gentle melting and softening process).
Turn off heat and stir in vanilla. Add the cereal and use a large spatula to stir gently until the cereal is evenly coated.
Pour into the prepared pan and press down gently (but don't try to pack them in too tightly). Cool at least 30 minutes, then cut into rectangles. Decorate with frosting and candy to create your favorite Halloween characters.
Notes
Marshmallows: For best results, use standard (large) marshmallows instead of mini marshmallows.
Frosting: If you don't want to buy orange or green frosting, make some by mixing vanilla frosting and food coloring.
Yield: This recipe will make 16 tall pieces (or less or more depending on how you cut them).
Storage: Store in an airtight container at room temperature for up to 5 days.