Mushroom and Herb Seitan Roast
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4.89 from 9 votes

Mushroom Seitan Roast

This roast is delicious hot out of the oven, but what I really enjoy is making the leftovers into sandwiches. After refrigerating, slice the seitan very thin and warm it in some gravy. Serve on crusty French bread with lettuce and tomato. Heaven!
Prep Time20 mins
Cook Time1 hr 15 mins
Total Time1 hr 35 mins
Course: Main Course
Cuisine: American, Holiday
Keyword: vegan roast, vegan thanksgiving
Servings: 6
Calories: 262kcal
Author: Susan Voisin


  • 10 medium mushrooms regular, crimini, or baby bella
  • 2 1/4 cups vital wheat gluten
  • 1/2 cup rolled oats or quinoa flakes (old fashioned oatmeal)
  • 1/4 cup nutritional yeast
  • 1 teaspoon dried thyme
  • 1 teaspoon rubbed sage
  • 1/2 teaspoon onion powder
  • 1/4 teaspoon hickory smoked salt optional
  • freshly ground black pepper
  • 1 1/2 cups vegetable broth room temperature
  • 2 tablespoons soy sauce, coconut aminos, or gluten-free tamari
  • 2 cloves garlic peeled
  • 1 tablespoon tahini or other nut butter


  • Wash and dry the mushrooms. Place them in a food processor fitted with the chopping blade and pulse until they are finely chopped. Set aside.
  • Combine in a mixing bowl: gluten, oats or quinoa flakes, nutritional yeast, thyme, sage, onion powder, smoked salt, and a generous grating of black pepper. Mix well to distribute all ingredients evenly.
  • Place the broth, soy sauce, garlic, and nut butter in blender and blend until smooth.
  • Add the contents of the blender and the mushrooms to the dry mix and stir until combined. Once it becomes hard to stir, use your hands to knead the ingredients together, making sure that all the dry mix is moistened. Shape into a ball and set aside.
  • Preheat oven to 400 F. Cut two 20-inch pieces of aluminum foil. Place them on the counter with one overlapping the other horizontally by about half its width. You should have a surface of foil about 20 inches wide by 20 inches deep. Cut a piece of parchment paper about 20 inches long and place it over the aluminum foil with the bottom edges even. Put the uncooked seitan in the middle of the parchment, and shape it into a loaf about 9-10 inches long. Fold the short ends over the seitan and then bring the long edge closest to you over and roll it up. Place it on a baking sheet with the edge of the foil down.
    Seitan Roast Instructions
  • Bake for 25 minutes. Turn over carefully and bake for another 25 minutes. Turn again and bake for another 20-30 minutes. Seitan should feel firm and not jiggly. You can test for doneness by cutting into the middle and making sure that it is firm and not dough-like. If necessary, give it more time.
  • Remove from oven and allow to cool for a few minutes before slicing. Keep leftovers tightly covered to prevent them from drying out.


Makes about 12 1/2-inch thick slices. 2 slices = 1 serving.


Serving: 2slices | Calories: 262kcal | Carbohydrates: 20g | Protein: 41g | Fat: 3g | Sodium: 429mg | Fiber: 1.4g