Description

This two-tone swirled slab fudge combines rich chocolate with a stunning visual swirl, making it an easy and impressive dessert for any occasion.

Ingredients

Scale

3 cups Granulated Sugar (600g) (For classic sweetness and solid structure)
0.5 cup Unsalted Butter (113g), 1 stick (Adds richness and a smooth, creamy texture. Or salted butter if that’s what’s in the fridge, just omit the extra pinch of salt)
1 can Evaporated Milk (12 oz / 354ml) (Essential for that dense, smooth fudge consistency)
1 bag Semi-Sweet Chocolate Chips (12 oz / 340g) (Forms the deep, rich chocolate base. My favorite is a high-quality brand for premium ingredient flavor!)
1 cup White Chocolate Chips (170g) (Creates the beautiful two-tone swirl and adds extra sweetness. Or white chocolate melting wafers for an even smoother swirl)
1 teaspoon Vanilla Extract (Enhances and rounds out all the chocolate flavors)
0.25 teaspoon Salt (Balances the sweetness and intensifies the chocolate)

Instructions

Combine Sugar, Butter, and Milk: In a large, heavy-bottomed saucepan, combine 3 cups granulated sugar, 0.5 cup unsalted butter, and 1 can evaporated milk. Heat over medium heat, stirring constantly with a wooden spoon until the butter melts and the sugar fully dissolves, looking clear and glossy. Bring the mixture to a rolling boil, which should take about 5-7 minutes.
Boil and Cook: Once it reaches a rolling boil (you’ll see large, continuous bubbles that don’t disappear when stirred), continue boiling vigorously for exactly 5 minutes, stirring occasionally to prevent sticking. (If it seems to be bubbling too aggressively and might scorch, reduce the heat slightly but maintain the rolling boil.) This specific boiling time is crucial for achieving that firm, classic hard fudge recipe texture.
Remove from Heat & Add Flavors: Immediately remove the saucepan from the heat. Stir in 1 bag semi-sweet chocolate chips, 1 teaspoon vanilla extract, and 0.25 teaspoon salt until the chocolate is completely melted and the mixture is smooth and glossy. The rich aroma will fill your kitchen! This typically takes 2-3 minutes.
Prepare White Chocolate Swirl: In a separate small microwave-safe bowl, melt 1 cup white chocolate chips gently. Microwave in 30-second intervals, stirring between each, until smooth and pourable, or use a double boiler method. This step takes about 1-2 minutes.
Layer and Swirl: Quickly pour the dark fudge mixture into an 8×8 inch pan lined with parchment paper, leaving an overhang on the sides for easy lifting. Immediately dollop spoonfuls of the melted white chocolate over the top. Using a butter knife or skewer, gently make a few passes through the two chocolates to create a beautiful two-tone swirled slab effect. Avoid overmixing; I find just 4-5 quick swirls give the best result for visual impact on your hard fudge recipe.
Chill to Perfection: Let the swirled slab fudge cool at room temperature for about 30 minutes until it loses its initial warmth. Then, transfer it to the refrigerator for at least 2 hours, or until it’s firmly set to the touch. The surface should feel solid and firm.
Cut and Serve: Once thoroughly firm, lift the entire slab of fudge out of the pan using the parchment paper. Place it on a cutting board and use a sharp knife to cut into 1-inch squares. This easy dessert is ready to enjoy!

Notes

Avoid crumbly fudge by sticking to the 5-minute vigorous boil. Undercooking causes soft fudge. For even swirls, avoid overmixing when adding white chocolate; a few gentle passes are key. Measure all ingredients (mise en place) before starting to save time.

Prep Time: 10 minutes
Cook Time: 15 minutes
Category: Dessert
Method: Stovetop
Cuisine: American

Nutrition

Serving Size: 1 square (25 g)
Calories: 140 calories
Sugar: 18 g
Sodium: 40 mg
Fat: 7 g
Saturated Fat: 4 g
Unsaturated Fat: 2 g
Trans Fat: 0 g
Carbohydrates: 22 g
Fiber: 1 g
Protein: 1 g
Cholesterol: 15 mg

Keywords: hard fudge, two-tone, swirled, chocolate, easy dessert, family-friendly, holiday, quick snack, no candy thermometer