Rich, creamy Russian Fudge with buttery caramel flavor, made right in the microwave. A quick temperature check takes out the guesswork and helps the fudge set with that classic firm-but-creamy texture.
Melt the butter. Add butter to a large microwave-safe bowl. Microwave in 30-second increments until completely melted.
Add the remaining ingredients except vanilla. Stir in white sugar, brown sugar, sweetened condensed milk, golden syrup, and whole milk. Mix well.
Microwave. Microwave the mixture for 4 minutes. Carefully remove the bowl and stir thoroughly, scraping the sides and bottom.
Microwave again. Return the bowl to the microwave for another 4 minutes.
Check the temperature. Carefully stir the mixture, then check with a digital thermometer. It should reach at least 235°F. If it hasn't, microwave in 30-second increments, stirring and checking the temperature after each one, until it reaches 235°F.
Cool briefly. Let the mixture cool for 1-2 minutes.
Beat the fudge. Add vanilla extract. Using a hand mixer, beat for 3-4 minutes, until the mixture thickens slightly and starts to lose its glossy look.
Transfer to the pan. Immediately spread the fudge into a greased or parchment-lined 7x11" baking dish.
Cool and cut. Let the fudge cool completely, at least 1 hour, before cutting into small squares.
Notes
Microwave wattage matters. This recipe was tested in a 950-watt microwave. A more powerful microwave may cook the fudge faster, while a lower-powered microwave may need additional time.
Watch the temperature, not just the clock. The fudge should reach at least 235°F before beating. If it doesn't get hot enough, it may stay too soft.
Use a large bowl. The mixture gets very hot and can bubble up during cooking. A bowl around 2.5 quarts or larger works well.
Be careful. Cooked sugar gets extremely hot. Use oven mitts when handling the bowl and keep children away while the mixture is hot.
Don't overbeat. Stop once the fudge has thickened and is beginning to lose its shine. Beating too long can make it dry or crumbly.
Golden syrup: I use Golden Eagle Syrup in this recipe. Traditional golden syrup, such as Lyle's, can also be used.
Store cooled fudge in an airtight container at cool room temperature or in the refrigerator. Separate layers with parchment or wax paper.