Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Cut the tempeh into 1-inch cubes and chop the red bell pepper into bite-sized pieces.
In a large bowl, toss the broccoli florets and bell peppers with the olive oil, sea salt, and black pepper.
Spread the vegetables on the prepared baking sheet and roast for 15-20 minutes until the edges are golden and tender.
While the vegetables roast, whisk together the maple syrup, tamari, apple cider vinegar, and garlic powder in a small bowl.
Heat a non-stick skillet over medium-high heat and add the tempeh cubes, searing for 3-4 minutes per side until browned.
Pour the maple-tamari glaze over the tempeh in the skillet and toss quickly for 1 minute until the sauce thickens and coats the cubes.
Remove the tempeh from the heat and sprinkle with nutritional yeast, tossing once more to create a savory crust.
Serve the glazed tempeh alongside the roasted vegetables in a shallow bowl.