Preheat oven to 400°F and line a large baking sheet with parchment paper.
In a small pot, combine the dry quinoa with 0.66 cups of water, bring to a boil, then cover and simmer for 15 minutes until fluffy.
Cut the tempeh into bite-sized cubes and break the broccoli into small florets.
In a large bowl, toss the tempeh and broccoli with olive oil, garlic powder, sea salt, and black pepper until evenly coated.
Spread the mixture onto the prepared baking sheet and roast for 20 minutes, flipping halfway through, until the tempeh is golden brown.
Place the baby spinach in a bowl and drizzle with lemon juice, tossing to slightly wilt the leaves.
Divide the cooked quinoa, roasted tempeh, and broccoli between two bowls.
Top each bowl with nutritional yeast and hemp seeds before serving.