Step 1

Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper and set aside.

Step 2

In a large bowl, beat the softened butter and brown sugar with an electric mixer until light and fluffy, about 2-3 minutes. Beat in the egg yolk and vanilla extract until combined.

Step 3

Add the flour and salt and stir by hand with a spatula until just combined. The dough will be crumbly.

Step 4

Press the dough evenly into the prepared pan. Bake for 20-25 minutes or until the edges are lightly golden brown.

Step 5

Optional caramel filling: In a microwave-safe bowl, combine the caramel candies and heavy cream. Microwave in 30-second intervals, stirring between each spin, until the caramels are melted and the mixture is smooth (about 1-2 minutes total).

Step 6

Remove the crust from the oven and immediately pour the caramel sauce over the hot crust, using an offset spatula to spread it evenly.

Step 7

Alternatively, immediately sprinkle the chocolate chips over the hot crust. Let stand for 3-5 minutes, then use an offset spatula to spread the melted chips into an even layer.

Step 8

Sprinkle the toffee bits and chopped pecans (if using) over the melted chocolate and set aside to cool.

Step 9

When the chocolate is set and the bars have cooled, cut into squares and enjoy! For clean cuts, refrigerate the bars for 30 minutes before slicing. Serve and enjoy!