Preheat the oven to 400 degrees and line a baking sheet with parchment paper.
Wash and dry the sweet potatoes. Cut them in half lengthwise and place on the baking sheet. Drizzle with olive oil & taco seasoning and toss to coat the potatoes on both sides. Place cut-side down and roast for 30 minutes. Remove from the oven.
Meanwhile, melt the vegan butter in a skillet over medium heat. Add the couscous and toast for a couple minutes, stirring frequently. Pour in the broth, cover and lower the heat. Simmer for 5-7 minutes, or until the broth has been absorbed and the couscous is tender. Taste and add salt if needed.
Add all of the sauce ingredients to a food processor and blend until smooth. Taste and adjust the seasonings as needed.
To assemble add some of the sauce to the bottom of each bowl. Top with couscous, sweet potato and any of the optional toppings.