2/3 cup semisweet chocolate chips (or 4 ounces semisweet chocolate)
Instructions
Preheat oven to 350 F and grease an 8-inch square pan.
In a large bowl, combine the flour, 1/4 cup sugar, and 1/4 cup of butter until crumbly. Press into the prepared baking pan.
Bake the shortbread for 12 to 15 minutes or until golden brown. Cool.
In a heavy saucepan, melt 1/2 cup butter. Add the corn syrup and the sweetened condensed milk. Bring to a boil and cook for about 12 minutes, stirring constantly, until the mixture turns a nice medium caramel brown color. Do not let the mixture scorch.
When it’s very thick and just begins to stick to the bottom of the pan as you stir, it’s time to remove from the heat; add the vanilla. Stir to blend and pour over the crust.
Melt chocolate chips in a heatproof bowl over simmering water; spread over the caramel layer. Chill until set, then cut into squares.