Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and cube the sweet potato and slice the carrots into rounds.
In a large bowl, toss the sweet potato, carrots, and broccoli with 1 tsp of olive oil, sea salt, and black pepper.
Spread the vegetables in a single layer on the baking sheet and roast for 20-25 minutes until tender and slightly caramelized.
While the vegetables roast, heat the remaining 1 tsp of olive oil in a non-stick skillet over medium-high heat.
Add the seitan strips to the skillet and sear for 3-4 minutes per side until the edges are golden brown and crispy.
Reduce the heat to low and stir in the tamari, garlic powder, and nutritional yeast, tossing the seitan until it is thoroughly glazed.
Remove from heat and serve the seitan strips alongside the roasted root vegetables.