1. Whisk together all ingredients except tempeh and cooking spray in a shallow dish.
2. Layer tempeh in marinade, cover, and refrigerate for 1 hour.
3. Heat a skillet over medium-high heat. Spritz with cooking spray and lay the tempeh flat on the skillet in single layers, taking care not to add more marinade to the pan than needed. Cook until tempeh is crisp on both sides, flipping half way through. Should not need more than 1-2 minutes per side.