These are really good and very easy to make! We did not make them with yams, but with the lighter sweet potatoes, but yams would work just as well.
First, let's start with a trick. You don't want your baked sweet potatoes to be hard and leathery.
So, peel the sweet potatoes and cut them into fries and but them in a bowl of water and soak them for at least 1 hour before you bake them. That way, the sweet potatoes would have soaked in more moisture than usual and will not be hard after baking.
1 large sweet potato, peeled and cut lengthwise and then halved
To prepare, proceed as follows:
Put water and salt to taste in a bowl. Dip your sliced sweet potatoes in the water, scooping them into another bowl, where you will have the following dry mixture:
1 Tbsp. sweet paprika powder
1 tsp. onion powder
1/2 tsp. garlic powder, all well mixed
Toss your "fries" in the dry mixture and then scoop into a cookie sheet already oiled with olive oil. And toss them again, until well coated.
Bake at 350º F, turning them every now and then, until golden brown on all sides.