Line an 8-inch square baking pan with parchment paper or non-stick aluminum foil. Lightly grease the lining to ensure easy removal of the fudge.

Place the white chocolate chips in a microwave-safe bowl. Microwave at 70% power for 90 seconds, then stir thoroughly to allow the residual heat to melt the chocolate. If needed, microwave in 15-second intervals, stirring after each, until smooth and fully melted.

Add the sweetened condensed milk to the melted chocolate and stir until the mixture is smooth and fully incorporated. If desired, include a pinch of salt to balance the sweetness.

Introduce a few drops of green food coloring into the mixture. Stir well until the color is evenly distributed and achieves the desired shade of green.

Pour the fudge mixture into the prepared pan, spreading it evenly with a spatula. Gently press the heart-shaped sprinkles onto the surface, arranging them in a grid of five rows and five columns to ensure one heart per fudge square.

Transfer the pan to the refrigerator and allow the fudge to chill for at least 4 hours, or until it is firm and set.

Once the fudge has fully set, remove it from the pan by lifting the parchment paper or foil. Use a sharp knife to cut the fudge into 25 equal squares, ensuring each piece includes a heart sprinkle at its center.