Line an 8x8 baking dish with parchment paper, leaving overhang on the sides for easy removal.

In a microwave-safe bowl, combine 1 cup white chocolate chips, 1/3 cup sweetened condensed milk, and 1 tablespoon butter. Microwave in 30-second intervals, stirring until smooth.

Stir in a few drops of blue food coloring until you reach your desired shade.

Pour the blue mixture into the prepared pan and spread into an even layer. Refrigerate for 20–30 minutes, until set but slightly tacky.

In a clean bowl, repeat the melting process with 1 cup white chocolate chips, 1/3 cup sweetened condensed milk, and 1 tablespoon butter. Stir in the vanilla extract.

Stir in a few drops of white food coloring until you reach your desired shade

Gently spread the white layer over the blue layer. Return to the fridge for another 20–30 minutes.

Repeat again with the final 1 cup white chocolate chips, 1/3 cup sweetened condensed milk, and 1 tablespoon butter. Stir in red food coloring.

Spread the red layer evenly over the top.

Sprinkle with red white and blue stars

Refrigerate for 2–3 hours, or until fully set.

Lift the fudge out using the parchment paper and slice into squares.