Add sweet potatoes and brussels sprouts into a bowl. Drizzle with olive oil and season with salt and pepper. Toss to combine, then transfer to a baking sheet and bake for 30 minutes. Flip halfway through so as not to burn. Allow the veggies to cool completely before making the salads.
While the veggies are roasting, prepare the dressing. Whisk together all the ingredients in a small bowl. Add water, 1 tablespoon at a time until you reach a consistency that is creamy, smooth and can be easily poured out of the bowl.
When ready to assemble the salads, grab two wide mouth mason jars (quart size). Divide the dressing evenly among the two jars, then top each with 1/2 cup chickpeas, 1 cup cooked quinoa, half of the roasted veggies, 1/4 cup pecans and 2 cups spinach. Seal the jars and leave in the fridge for at up to 5 days.