Prepare the Pan: Begin your culinary adventure by lining an 8×8-inch pan with parchment paper. This simple step ensures your fudge will be ready to lift and serve with ease once set.

Combine Ingredients: In a large, heavy-bottomed saucepan, mix the sugar, butter, and melted vanilla ice cream. Heat the mixture over medium heat until it reaches a rolling boil, stirring to blend the ingredients smoothly.

Monitor the Temperature: Carefully attach a candy thermometer to the saucepan. Reduce the heat to maintain a steady boil and continue cooking until the thermometer reads 234°F, the soft ball stage. Consistent stirring is key to preventing burning and ensuring an even texture.

Add Chocolate: Once the mixture reaches the desired temperature, remove from heat and stir in the white chocolate and green mint chips. Vigorously mix with a wooden spoon until the chips have completely melted into a smooth consistency.

Incorporate Marshmallow Crème: For that creamy, delightful texture, add the marshmallow crème to your mixture. Stir until the fudge base is well blended and smooth.

Pour and Decorate: Carefully pour the fudge mixture into your prepared pan. Smooth the surface with a spatula, and for that final festive touch, sprinkle with shamrock sprinkles.

Cool: Allow the fudge to cool at room temperature. Once set, use the parchment paper to lift the fudge from the pan and transfer it to a cutting board.

Cut and Serve: Cut the fudge into squares. Depending on your preferred size, this recipe yields about 24 pieces, ready to be shared and enjoyed.