A caramel, walnut, and coconut filling, sandwiched between graham crackers, and topped with a simple buttercream frosting. Walnut Oh Henry Bars are a deliciously classic Newfoundland Christmastime recipe.
Begin by lining the bottom of a 9x13 Pyrex baking dish with a layer of graham crackers. Try to get into the corners and if you need to, use a serrated knife to cut the crackers to fit.
Add the brown sugar, butter, milk, and vanilla to a sauce pan and over medium heat, whisk together until mixture comes to a low boil. Lower heat to medium low and continue to slowly whisk the mixture and allow to cook for 5 minutes.
Turn off the heat and stir in the walnuts, coconut, and graham crumbs. Stir together well.
Pour the mixture over the layered graham crackers.
Apply a second layer of graham crackers to the top of the walnut mixture. Press the crackers very lightly into the walnut mixture so that it sticks.
Set the Pyrex pan aside and allow to cool for an hour before placing in the refrigerator for 3 hours.
For the frosting
Use a handheld mixer to blend together all frosting ingredients until smooth.
Spread the frosting over the bars and top with extra walnut pieces for garnish. Cut into 24 squares and enjoy!