Peel and cut the sweet potatoes into French fries. 1 cm x 0.5 cm thick, they crisp up well. 5 - 6 cm long.
Whatever size you make, try to get them as evenly sized as possible so that they cook at the same time.
Soak the sweet potatoes in cold water for an hour to remove the starch from the surface. Dry thoroughly on a towel or paper towel. Rinsing and drying will ensure a crispier roasting result. Put in a bag and add olive oil.
Mix the spice mix in a cup and pour into the bag. Shake vigorously. Pour the sweet potato fritters onto a baking sheet as widely as possible.
Bake the sweet potato fries in a 200°C oven for 30-40 minutes, until the fries are starting to colour well and the surface is crispy. Turn over halfway of baking. Be very careful as temperatures vary in different ovens, take care not to burn the fries.
Meanwhile, crumble the blue cheese into the sour cream and swirl into a dip.
Serve the Crispy Sweet Potato Fries with a dip immediately when they come from oven.