Best Rice Krispies Treats

Birthday Rice Crispy Treats Recipe

These ultimate Birthday Rice Krispie Treats are huge, gooey, and the perfect no-bake treat for birthdays!
Course Dessert
Cuisine American
Keyword bake sale, bake sale recipe, birthday, birthday treat, marshmallow, rice krispie treats, rice krispies
Prep Time 15 minutes
Cook Time 8 minutes
Resting Time 1 hour
Total Time 1 hour 23 minutes
Servings 24 large treats
Calories 296kcal
Author Jillian - a Food, Folks and Fun original!


Rice Krispy Treats:

  • 6 Tablespoons butter
  • 1 16-ounce package mini marshmallows
  • 3 7 ounce jars marshmallow fluff or creme
  • 2 teaspoons pure vanilla extract
  • 15 cups Rice Krispies cereal
  • ½ cup rainbow jimmies + more for garnish


  • 8 Tablespoons butter, softened
  • 1 cup confectioners’ sugar, sifted
  • ¼ teaspoon pure vanilla extract
  • ½ Tablespoon cream or milk
  • Pinch salt


  • Line 13x9-inch baking pan with foil, extending foil over edges. Lightly spray foil with nonstick cooking spray.
  • In a very large pot or Dutch oven melt butter over low heat. Add marshmallows; stir constantly and cook until melted. Remove pot from heat and stir in marshmallow fluff and vanilla. Gently stir in Rice Krispies and jimmies until cereal is evenly coated. Pour mixture into prepared pan and use wax paper over the top to press mixture firmly into pan. Let treats cool for at least 1 hour before frosting.


  • Using a stand mixer beat butter on medium-high speed until smooth, about 30-60 seconds. Reduce speed to medium-low and slowly add confectioners’ sugar, and beat until smooth, about 2-5 minutes. Add vanilla, cream, and salt and increase speed to medium-high and beat until light and fluffy, about 4-8 minutes.
  • Spread buttercream evenly over treats (I like using a small offset spatula). Garnish with rainbow jimmies. Using foil liner, lift treats from pan. Cut into 24 bars and serve.


Serving: 1treat | Calories: 296kcal | Carbohydrates: 59g | Protein: 1g | Fat: 7g | Saturated Fat: 4g | Cholesterol: 17mg | Sodium: 165mg | Potassium: 21mg | Sugar: 35g | Vitamin A: 1370IU | Vitamin C: 11.1mg | Calcium: 3mg | Iron: 5.4mg