Preheat oven to 300F. Line a baking sheet with parchment paper
In a small bowl, mix the tomato powder through pepper until well combined.
Carefully lay the tempeh slices on the sheet in an even layer and then spray (or brush lightly) one side with olive oil. Sprinkle half of the tomato-spice mixture on the tempeh slices and press slightly to adhere.
Turn over the slices, spray/brush with olive oil and sprinkle with remaining spice mixture.
Bake for 45-50 minutes until tempeh is slightly crisp, turning once or twice while baking. I let some of mine get a little brown, I like the crispy edges. Enjoy straight from the oven!