01 - Preheat the oven to 410°F. Line two baking sheets with parchment paper for easy cleanup.
02 - In a medium bowl, whisk together maple syrup, mustard, soy sauce, apple cider vinegar, olive oil, garlic, smoked paprika, and black pepper until well combined.
03 - Add the tempeh cubes to the marinade, tossing thoroughly to ensure even coating. Allow to marinate for at least 15 minutes at room temperature.
04 - Toss the halved Brussels sprouts with olive oil, salt, and pepper. Arrange them on one baking sheet, cut side down for optimal caramelization.
05 - Spread the marinated tempeh cubes on the second baking sheet in a single layer, ensuring pieces are not overcrowded for even roasting.
06 - Roast Brussels sprouts for 25–30 minutes, flipping halfway through cooking, until golden brown and caramelized.
07 - Roast tempeh for 20–25 minutes, flipping once halfway through, until edges are browned and coating becomes sticky and caramelized.
08 - Divide the cooked rice or quinoa among four bowls. Top each with spinach or greens, roasted Brussels sprouts, and sticky maple mustard tempeh.
09 - Garnish with sliced avocado, toasted pumpkin seeds, and a squeeze of fresh lemon if desired. Serve immediately while warm.