-I've heard that glucomannan in caramel sauce won't cause it to set up as much as xanthan gum, so substitute at your own risk.
-Each Light Rye Wasa cracker contains 5.5 grams of net carbs, so if you cut the toffee into 10 pieces you get about 3.3 grams of net carbs per serving from the crackers.
-If your toffee turns out soggy, try cooking the caramel longer next time before pouring it over the crackers and/or baking the toffee longer (possibly at a higher temperature). Keep in mind that the toffee will probably be firmer after chilling as well.