Preheat oven to 350°F.
Mix together ingredients from garlic powder through black pepper. Press each side of the tofu slices into the spice mixture.
Heat 1 tablespoon olive oil in a medium oven-safe skillet over medium-high heat. Add tofu slices and cook until nicely browned on each side, about 3 minutes each side. Remove tofu and set aside.
Add 1 teaspoon olive oil and 1/2 cup sliced zucchini and 1 cup sliced cremini mushrooms to the pan. Sauté until mushrooms and zucchini are soft and golden, about 5 minutes.
Turn heat down to low and add tofu back to the pan, along with 3/4 cup no-sugar-added marinara sauce. Stir to combine.
Bake for 10 minutes or until heated through.