It’s delicious uniqueness and utter whimsical quality make this root beef float fudge a one-in-a-million treat for any occasion!

Root Beer Float Fudge. Seriously….why not?

Although this may be the most tooth-achingly sweet treat I have ever encountered, it’s delicious uniqueness and utter whimsical quality make it a one-in-a-million treat for any occasion.

Marshmallow topped light colored squares of fudge on a piece of parchment paper.

I was astounded at how truly root-beer-floatish this confection tasted! I’ll admit, fudge doesn’t rank that high up on my favorites list (I know, the shame!), but I quite enjoyed this terrific variation.

And my husband and kids? Well, let’s just say that root beer float fudge has never seen such devoted fans.

Top view of two squares of light colored fudge topped with marshmallows.

One Year Ago: Chocolate Chip Gingerbread Cake
Two Years Ago: Thick and Chewy Double Chocolate Cookies

alt=" "

Root Beer Float Fudge

No ratings yet


  • 4 cups (848 g) granulated sugar
  • ½ cup light corn syrup
  • ½ cup heavy cream
  • 1 cup milk
  • 1 teaspoon salt
  • 1 tablespoon pure vanilla extract
  • 2 teaspoons root beer extract/flavoring
  • 2 ½ cups (143 g) mini marshmallows


  • In a 4-quart saucepan, combine the sugar, corn syrup, cream, milk and salt. Clip a candy thermometer to the side of the pot and cook the mixture over medium heat, stirring constantly with a heatproof rubber spatula, until the mixture reaches 236 degree F on the thermometer. Remove the pot from the heat and stir in the vanilla and root beer extracts.
  • Pour the mixture into a 9X13-inch baking pan (you’ll be mixing it again later). Leave the pan undisturbed to cool at room temperature for about an hour. (Do not stir during this step or the fudge can turn to sugar.)
  • When cool enough, pour the mixture into a large mixing bowl and mix on medium speed or by hand using a wooden spoon. If using a mixer, it will require approximately 3 minutes of mixing. Mixing by hand will take about 6 minutes. When the fudge begins to lighten in color, lose a bit of it’s shine and thicken slightly, stir in the mini marshmallows and stop mixing.
  • Butter a 9-inch square baking pan, pour in the mixture, and spread evenly with an offset spatula. Allow the fudge to set and crystallize for 1 hour or longer at room temperature. It will lighten in color as it cools. Cut into desired pieces and serve. The fudge should be stored tightly covered at room temperature or refrigerated tightly sealed for longer storage.
Serving: 1 Small Square, Calories: 284kcal, Carbohydrates: 66g, Protein: 1g, Fat: 3g, Saturated Fat: 2g, Cholesterol: 11mg, Sodium: 168mg, Fiber: 1g, Sugar: 64g

Recipe Source: adapted slightly from Chocolates and Confections from the Culinary Institute of America

Step-by-Step Photos:

Stir together the ingredients, except the extracts, in a saucepan. Two pounds of sugar takes a while to dissolve. Don’t stress.

sugar mixture dissolving in a large pot with a wooden spoon and candy thermometer inside

It will start looking smooth and combined.

melted butter in a pot being stirred with a wooden spoon

Start cooking the fudge, stirring constantly.

butter and sugar mixture being stirred in a pot with a wooden spoon

Keep going. It will bubble and foam so make sure you are using a large enough pot to accommodate the bubblage.

butter and sugar mixture boiling and being stirred by a wooden spoon

Take it off the heat when your candy thermometer registers 236 degrees F.

candy thermometer registering at 236

Pour in the root beer and vanilla extracts.

butter mixture in a pot with vanilla extract being poured in

Stir ’em up.

wooden spoon stirring a bubbling fudge mixture

Pour the mixture into a 9X13-inch pan and let it cool undisturbed. Don’t touch it, in other words.

dark colored fudge in a glass 9x13

Scrape the mixture into a bowl and stir it with a wooden spoon or beat it with a mixer.

dark colored fudge mixture in a glass bowl

Keep going until the mixture is lighter in color and has thickened slightly and lost some of it’s shine.

dark fudge mixture in a glass bowl being stirred by a wooden spoon

The mixture is ready for the marshmallows.

bubbly fudge mixture in a glass bowl

Pour them in.

fudge mixture in a glass bowl with marshmallows being dumped in

Stir them up.

dark colored fudge with marshmallows mixed in in a glass bowl

Prepare your buttered pan if you haven’t already…

buttered 8x8 pan

…and pour in the fudge.

marshmallow studded fudge being poured into a glass 8x8 pan

Let it cool to room temperature. It will lighten in color. Cut into pieces and serve!

dark colored fudge with marshmallows in an 8x8 glass pan