Preheat the Oven:

Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish or line it with parchment paper for easy removal.

Prepare the Crust:

In a medium bowl, combine the graham cracker crumbs, melted butter, and granulated sugar. Mix until the crumbs are evenly coated with butter and sugar.

Press the Crust:

Press the graham cracker mixture firmly into the bottom of the prepared baking dish to form an even crust layer. Use the back of a spoon or a flat-bottomed glass to help pack it down.

Make the Toffee Layer:

In a medium saucepan over medium heat, melt the 1 cup of unsalted butter. Stir in the brown sugar, corn syrup, and salt. Bring the mixture to a boil while stirring continuously. Once it reaches a boil, reduce the heat to low and simmer for 5 minutes, stirring occasionally.

Add Vanilla Extract:

Remove the saucepan from the heat and stir in the vanilla extract.

Pour over the Crust:

Pour the hot toffee mixture evenly over the graham cracker crust in the baking dish. Use a spatula to spread it out and make sure it covers the entire crust.

Bake:

Place the baking dish in the preheated oven and bake for 10-12 minutes or until the toffee layer is bubbling and has a rich caramel color.

Add Chocolate Topping:

Remove the dish from the oven and immediately sprinkle the milk chocolate chips evenly over the hot toffee layer. Let the chocolate chips sit for a few minutes to soften, and then use a spatula or the back of a spoon to spread the chocolate into a smooth layer.

Sprinkle with Twix Bars:

Sprinkle the chopped Twix bars over the melted chocolate layer. Press them gently into the chocolate.

Chill and Set:

Place the baking dish in the refrigerator for at least 2 hours or until the bars are completely set.

Cut into Bars:

Once the bars are set, use a sharp knife to cut them into squares or rectangles. You can make them as big or as small as you like, but a typical serving size is a 2x2-inch square.

Serve and Enjoy:

Remove the Twinkling Twixmas Toffee Bars from the baking dish and serve. Enjoy the sweet and crunchy layers of graham cracker crust, toffee, and creamy milk chocolate with a delightful Twix twist!