Preheat oven to 375 F (190 C). Line a baking sheet with parchment paper or foil and spray with non-stick spray.

Cut tempeh into nugget-shaped slices.

In a small bowl, mix together the peanut butter, lemon juice, soy sauce, and nutritional yeast. Slowly add in small amounts of water until it has a sauce-like consistency that's not too runny. Add salt/pepper to taste.

Dip tempeh into sauce and fully coat it. Place on baking sheet. Make sure you reserve a small amount of the sauce for later.

Bake in the oven for about 30 minutes or until peanut butter has formed a crust.

Drizzle extra sauce on top and serve.