In a large bowl, mix 2 cups flour, oats, brown sugar, baking soda and salt. Slowly mix in the butter until the mixture is crumbly. Transfer half of the mixture to the prepared baking dish and bake for 8 to 10 minutes. Pull from the oven let cool for a few minutes.
Mix the remaining 3 tablespoons flour with the caramel until smooth. Layer the chocolate, nuts and caramel on the baked cookie base. Add the caramel last. Add the remaining unbaked crumble on top and bake an additional 12 minutes. Pull when slightly browning on top.
For the candied nuts: In a saucepan over medium heat, reduce 1/2 cup water and the sugar until it starts to crystallize or comes close to evaporation. Stir in the cinnamon, salt and vanilla. Add the nuts and continue to mix until coated. Remove from the heat and let cool.
For the whipped cream: Using a stand mixer with a whisk attachment (or whisk by hand), whisk the heavy cream to soft peaks. Slowly add in the sugar and vanilla and whip until just stiff peaks. Adjust sweetness if necessary with more sugar.
Slice the cookie into bars and serve each piece topped with whipped cream and candied nuts.
This recipe was created by a contestant during a cooking competition. The Food Network Kitchens have not tested it for home use, therefore, we cannot make any representation as to the results.