Step 1: Prepare Your Pan

Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper for easy removal after baking.

Step 2: Make the Shortbread Base

In a mixing bowl, combine 1 cup of softened unsalted butter, 2 cups of all-purpose flour, 1/2 cup of granulated sugar, and 1 teaspoon of vanilla extract. Blend the ingredients together until a dough forms. Press the dough evenly into the prepared baking pan. Bake for 20 minutes or until the edges are lightly golden. Once baked, remove from the oven and let it cool completely.

Step 3: Prepare the Caramel Layer

In a saucepan over medium heat, combine 1/2 cup of unsalted butter, 1/2 cup of packed brown sugar, 1 can (14 oz) of sweetened condensed milk, and 2 tablespoons of light corn syrup. Stir constantly as the mixture heats, ensuring it doesn’t stick to the bottom. Continue stirring until the caramel thickens and turns a golden color. Once ready, pour the caramel over the cooled shortbread layer and let it set.

Step 4: Make the Chocolate Topping

In a microwave-safe bowl, melt 2 1/2 cups of milk chocolate chips together with 1 tablespoon of vegetable oil. Heat in short intervals, stirring in between until smooth. Pour the melted chocolate over the caramel layer and spread it out evenly with a spatula. Allow the entire dish to set completely at room temperature or in the refrigerator for a quicker setting.

Step 5: Slice and Serve

Once the chocolate layer has fully set, use a sharp knife to cut into bars. Enjoy the decadent homemade Twix bars as a sweet treat whenever you crave something delicious.