Preheat the oven to 275°F. Spray a large rimmed baking sheet with oil. Spray two sheets if you want to cook them all at once. Set aside.
Wash the kale. Strip the leaves off then stems; then tear the leaves into 1-2 inch pieces. Dry them really, really well.
Put the leaves in a large bowl, and pour the oil & vinegar over the kale.
In a small bowl, stir together all the remaining ingredients. Set aside.
With your hands {it's easier this way}, toss the kale, making sure all the leaves are coated in the oil & vinegar.
Then sprinkle the nutritional yeast-spice mixture all over, and toss to coat. Make sure all the leaves are coated.
Put about half the leaves onto the prepared pan. Make sure they are in a single layer! It's very important that they are in a single layer, and try to lay them as flat as you can get them.
Put them in the oven and bake about 12 minutes. Take out of the oven & carefully flip them over.
Bake about 3-5 more minutes. You want to pay attention here because some will cook/burn faster than others. They will crisp up more after they come out of the oven and cool on the baking sheet, so err on the side of slightly underdone. When you lightly press them, they should feel like they might crumble under the pressure of your finger.
Once you think they are ready, take them out and let them cool completely on the baking sheet.
Repeat with the other half.
Store them in an airtight container. Be careful because they are delicate.