01 - Preheat oven to 400°F. Line a large baking sheet with parchment paper.
02 - Toss the cubed sweet potato, broccoli florets, and cauliflower florets with olive oil, smoked paprika, salt, and pepper until evenly coated. Spread in a single layer on the prepared baking sheet. Roast for 20 to 25 minutes, stirring halfway through, until the vegetables are tender and lightly caramelized at the edges.
03 - While the vegetables roast, combine the rinsed quinoa, water, and a pinch of salt in a medium saucepan. Bring to a rolling boil over medium-high heat, then reduce to low, cover, and simmer for 15 minutes or until all liquid is absorbed. Remove from heat and let sit covered for 5 minutes. Fluff gently with a fork.
04 - In a small bowl, whisk together the tahini, lemon juice, maple syrup, water, and minced garlic until completely smooth. Add additional water, one tablespoon at a time, until the dressing reaches a pourable consistency. Season with salt and pepper to taste.
05 - Divide the fluffed quinoa evenly among four bowls. Arrange the roasted sweet potato, broccoli, and cauliflower alongside the cherry tomatoes, shredded red cabbage, sliced avocado, and baby spinach. Drizzle generously with the tahini dressing and sprinkle with pumpkin seeds.
06 - Serve immediately while the roasted vegetables are still warm.