Set oven to 375 degrees.
Wash sweet potatoes and cut into French fry shapes.
Toss in bowl with olive oil, salt, pepper and rosemary.
Place fries on nonstick baking sheet or parchment paper. Make sure fries don’t touch.
Bake 20 minutes, flip and bake another 20 minutes. Outside should be crispy but inside soft.
Serve with ketchup or enjoy plain.