Dice the sweet potato into small 1/2-inch cubes and halve the Brussels sprouts for quick cooking.
Heat the olive oil in a large skillet over medium-high heat.
Add the sweet potatoes and sprouts to the pan, seasoning with half the salt and pepper.
Sauté the vegetables for 8-10 minutes, stirring occasionally, until they are tender and caramelized.
While the vegetables cook, cut the chicken into bite-sized pieces and season with garlic powder, smoked paprika, and the remaining salt and pepper.
Push the vegetables to the edge of the skillet and add the chicken to the center, cooking for 6-8 minutes until golden and opaque.
Whisk the tahini, lemon juice, and water together in a small ramekin until smooth and creamy.
Portion the cooked quinoa into a travel container, top with the chicken and vegetable mixture, and drizzle with the tahini sauce.