Prepare the seitan beef or protein of choice. Cut into ½" to 1" cubes.
In a small bowl or measuring cup, whisk the broth and cornstarch. Set aside.
If using oil, heat the oil in a large oven safe pot or dutch oven over medium heat. Add the onions and carrots and cook for 3-5 minutes to. brown. Add the garlic and cook for 30 seconds.
Add the beef and potatoes. Then pour on the broth-cornstarch mixture to deglaze.
Add the salt, rosemary and thyme and stir. Bring the mixture to a simmer.
Cover, transfer to the oven, and bake for 45 minutes. Serve warm.