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Single Serving Rice Krispie Treat

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Have a craving for Rice Krispie Treats, but don't want to make a whole pan of them? This Rice Krispie Treat in a mug is single serving and needs only 3 ingredients, 2 minutes and a microwave. One Rice Krispie Treat, just for you! Try my chocolate mug cake next.

A spoonful of Rice Krispie treat in a white mug being pulled out to show the melty marshmallow

Fiona said: “I made the fluffernutter rice krispy treats months ago and I wanted them again but couldn’t justify making a whole pan. This was perfect.⭐⭐⭐⭐⭐

One day, I discovered that I didn't have any dark chocolate – and with the way I reacted to it, you would have thought someone told me a dinosaur had eaten my car.

I welled up with tears and got unreasonably upset and just sat on the floor of our pantry for a good 10 minutes. Why? Who knows.

But my solution was to go the marshmallow route: A single serving Rice Krispie treat in a mug.

This recipe is great for people who:

  • Live alone and can't justify making an entire pan of Rice Krispie treats right now
  • Just want a single serving Rice Krispie treat to satisfy a craving in the moment
  • Don't feel like putting the effort in for a full pan recipe
  • Need something sweet. Like, right now.
  • Need a reprieve from that box of stale Girl Scout cookies in that flavor it turns out you don't love (no that hasn't happened to me).
Four photo collage showing the process of making rice krispie treat in a mug

Ingredients for Rice Krispie treat in a mug

  • 1/2 Tablespoon unsalted butter
  • 6 large marshmallows or 3/4 cup mini marshmallows
  • 1/2 cup to 3/4 cup Rice Krispies cereal

Tips for making the best single Rice Krispie Treat

This recipe is very simple, and would even be good to make with kids because you don't need to use an oven or mess with any complicated steps.

  • Melt 1/2 tablespoon butter in a mug first, swirl it around, then add marshmallows and heat again. This way the butter kind of acts as a non-stick spray and makes it easier to stir the ingredients together.
  • Only add 1/2 cup of Rice Krispies cereal at first, then add more if you want it to be thicker. I prefer my ratio of cereal to marshmallow to be more marshmallow-heavy, but to each their own. This ratio is also easier to eat with a spoon.
  • Also, make sure to use a large enough mug that the marshmallows don't overflow. The smallest mug I use is an 8 ounce capacity, and you still see the marshmallows expand up over the top for a couple seconds, but they come right back down into the mug once it stops heating. I recommend a 12 ounce mug to have enough room for stirring and such.
  • Use fresh marshmallows! I can't emphasize this enough. If you try to use a bag of mini marshmallows that have been hanging out in the back of your pantry since last Christmas and have the texture of little doorstops, they're not going to melt and it just plain won't work. New, squishy and soft marshmallows are essential!
  • And use fresh cereal, for that matter. Don't use stale cereal either, because you will notice.
Mini marshmallows expanding out the top of a white mug in the microwave

Want a single serving Rice Krispie Treat square?

Easy. If you want to straight up make it a single serving Rice Krispie treat bar, make it the same way and then just press it into a square shape on a plate and let it set for a few.

Boom! Single serving handheld Rice Krispie treat.

Single rice krispie treat square on a white plate atop a black and white dish towel

Want more rice krispie treats?

Overhead shot of Rice Krispie Treat in a white mug with marshmallows on a white wood surface

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2-Minute Rice Krispie Treat in a Mug

5 from 8 votes
Have a craving for Rice Krispie Treats, but don't want to make a whole pan of them? This Rice Krispie Treat in a mug is single serving and needs only 3 ingredients, 2 minutes and a microwave. One Rice Krispie Treat, just for you!
Prep Time: 1 minute
Cook Time: 1 minute
Total Time: 2 minutes
Servings: 1 serving

Ingredients
 

Instructions

  • In a microwave-safe mug (preferably 12 ounces) or small bowl, add butter and microwave for 15-20 seconds or until just melted. Tip the mug slightly to the side and roll the melted butter around to coat the edges a bit.
    1/2 Tablespoon (½ Tablespoon) unsalted butter
  • Add marshmallows and microwave again for 30 seconds. Carefully remove from microwave and stir to combine. Immediately add Rice Krispies cereal and stir to combine. Start with 1/2 cup, then add up to another 1/4 cup more if you'd like it thicker.
    6 large marshmallows
    1/2 to 3/4 cup (64 grams) Rice Krispies cereal
  • If you want to make a single serving Rice Krispie treat square, press it into a square shape on a plate and let it set for a few.
  • Serve and enjoy!

Video

Notes

Cereal to marshmallow ratio: Start with 1/2 cup of Rice Krispies cereal at first, then add more if you want it to be thicker. I prefer my ratio of cereal to marshmallow to be more marshmallow-heavy, and it's also easier to eat with a spoon.
Mug size: You want your mug to be at least 8 ounces, but preferably 12 ounces.
Microwave wattage: My microwave is 1500 watts, so you may need to adjust your time to be less or more depending on the wattage of your microwave.

Nutrition Facts

Calories: 237kcal | Carbohydrates: 46g | Protein: 2g | Fat: 6g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 1g | Cholesterol: 15mg | Sodium: 108mg | Potassium: 21mg | Fiber: 1g | Sugar: 26g | Vitamin A: 1106IU | Vitamin C: 9mg | Calcium: 4mg | Iron: 4mg

Nutrition Disclaimer

The provided nutrition information is generated by an automatic API and does not take variations across specific brands into account. This information is provided as a general guideline and should not be treated as official calculations. Learn more here.

Recipe created by Leslie Kiszka

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10 Comments

  1. 5 stars
    This worked great with dandies vegan natural marshmallows & fruity organic rice crispy cereal. I only had challenge butter with olive on hand and I worked good. I mixed them together in a glass cereal bowl. Can’t wait to eat them in a little bit. Thank you

  2. 5 stars
    I made the fluffernutter rice kripy treats months ago and I wanted them again but couldn’t justify making a whole pan. This was perfect, I just added a little peanut butter at the end

  3. One of my best friends made me a platter of rice krispy treats for my baby shower, ALL mine! Never mage them myself. This is very close to hers! Thank you & yum!