Line an 8x8-inch (20x20 cm) square baking pan with parchment paper, leaving an overhang on the sides for easy removal.
In a microwave-safe bowl, combine the chocolate chips and unsalted butter. Microwave in 30-second intervals
Stir in the sweetened condensed milk until well combined. The mixture should be thick and glossy.
Add the orange zest and fresh orange juice to the mixture. For a vibrant color, add a few drops of orange food coloring (optional).
Gently fold in the toffee bits, reserving a handful for topping.
Add a pinch of salt to enhance the flavors. Mix well.
Stir in the vanilla extract for that extra layer of flavor.