There is a great new company at PapaLena.com that has beet chips and sweet potato chips. Both have about 9 carb grams per serving, and both are low on the glycemic index. Just remember to have equal grams of protein with them - a slice of ham, or turkey, or chicken, or a protein drink or lowfat ounce of cheese.
If you want to make your own sweet potato chips, here is the recipe:
BAKED SWEET POTATO CHIPS
Heat oven to 350. Peel sweet potato (works with yams too) and slice thin, as if for a thick potato chip. Cover a cookie sheet or baking pan with foil, sprayed lightly with vegetable spray. Lay sweet potato chips on the foil, rubbing each one slightly in the veggie spray. Then lightly spray the tops with veggie spray, sprinkly with your favorite spice (I use garlic salt or something called crazy salt). Bake for 20 minutes, turn, sprinkle that side, and bake for another 10 minutes.