Name: Crispy Sweet Potato Fries (Lots of Tricks)
Prep time: 20 min
Total time: 105 min
Yield: 2 servings
Ingredients: 1¼ lb sweet potatoes; 1 tsp thyme; 1 tsp rosemary; 5 tbsp olive oil; 2 tbsp cornstarch; 1 tsp paprika (sweet); ¼ tsp salt

Ingredients

Prep: 20 min
Rest: 60 min
Total: 105 min

1¼

lb

sweet potatoes

1

tsp

thyme

1

tsp

rosemary

5

tbsp

olive oil

2

tbsp

cornstarch

1

tsp

paprika (sweet)

¼

tsp

salt

Ingredients for sweet potato fries, seen from above

Step 1

1¼

lb

sweet potatoes

Cut the sweet potatoes into strips.
Put the strips into a large bowl of water and leave them for at least 1 hour. The longer, the better (e.g. overnight).
Then drain the water and dry the strips with a kitchen towel.

Sweet potato strips soaking in water after cutting, step 1

Step 2

2

tbsp

cornstarch

Sprinkle the strips with baking powder until they're evenly coated with a thin white layer.

Sweet potato strips dusted with starch, step 2

Step 3

5

tbsp

olive oil

1

tsp

thyme

1

tsp

rosemary

1

tsp

paprika (sweet)

Mix in the oil and spices. Don't salt them yet.

Marinated sweet potato strips in a bowl, step 3

Step 4

¼

tsp

salt

Spread the sweet potato strips on a baking sheet.
Bake at 480 °F / 250 °C convection for 25 minutes. Turn the fries after 15 min.
Finally, salt the fries in a large bowl.

Side view of sweet potato fries in a bowl, with a dip next to them

Tips

Tips for extra crispy fries:

Soaking draws some of the starch out of the sweet potato, so the inside doesn't cook too quickly.
After soaking, sprinkle with baking powder.
Don't let the sweet potato strips overlap in the oven, and turn them now and then.
Open the oven door every now and then while baking to let the steam escape.
Only salt them after baking.
Serve the sweet potato fries in a large bowl so any remaining moisture can escape.

Nutrition

estimated per serving

531kcal
4.9 gProtein
68.6 gCarbs
25.3 gFat

Calculated from all ingredients, including the sides. Values vary depending on the product, the size of the vegetables and how you prepare them.

Cost Test phase

estimated per serving

about €1.20

What goes into the price

sweet potatoes€0.90
olive oil€0.17
cornstarch€0.04
thyme€0.04
rosemary€0.04

Total €1.19 per serving, rounded to about €1.20. Not counted: paprika, salt.

This section is still in a test phase: a rough estimate based on conventional German discount-supermarket prices (as of September 2026). Only the amounts used are counted, excluding salt, pepper and spices.