Preheat oven to 350F. Line an 8-inch square baking pan with
aluminum foil leaving overhang, spray with cooking spray; set
aside. This is a messy recipe and I highly suggest lining your pan for
easier cleanup.
Shortbread Crust - Combine all ingredients in a medium mixing
bowl, cutting in the butter with a pastry cutter, wooden spoon, or
your fingers until until a sandy, crumbly mixture forms. Transfer
crumbly mixture to prepared pan and using your fingertips, press
crumbs down to form an even flat layer of crust. Pierce crust with a
fork haphazardly in a dozen places so steam can escape while it
bakes. Bake for 12 to 15 minutes, or until crust has just barely set.
It should not be golden or browned at all, it should still be white,
but crusted over and set. While crust bakes, make the filling.
Peanut Butter Filling - Melt the butter in a medium microwave-safe
bowl, about 1 minute. Add the 3 remaining ingredients and stir
until smooth. Spread over crust. Crust does not have to be cool, and
spreading it while crust is still warm is beneficial. The filling is thick
and resists being spread, but take your time and either push it into
place with your fingers, use a spatula, or knife, taking care not to
rip the crust while spreading the filling.
Caramel Layer - Pour caramel sauce over peanut butter. It should
smooth out on its own but if necessary, spread it into corners and
sides of pan with a knife.
Chocolate Layer - Combine the 2 ingredients in a medium
microwave-safe bowl and heat to melt, about 1 minute. Stop to stir
and heat in 15-second bursts until mixture can be stirred smooth.
Pour chocolate over caramel layer and if desired, smooth it very,
very lightly with an offset spatula or knife.
Cover pan with aluminum foil (to prevent fridge smells), and place
pan in the refrigerator for at least 3 hours, or overnight, before
lifting out with foil overhang, and slicing and serving. If bars have
become very cold, allow them to come up to room temperature for
a few minutes before slicing. I prefer to store the bars in the
refrigerator, where they'll keep for at least 10 days, or in the freezer
for up to 3 months. Crust may lose some degree of snap and crunch
if storing the bar for longer durations, but it's very liveable.
Originally Submitted
2/17/2015
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