In a small bowl, combine the millet, cilantro, lime juice, and salt. Stir to combine and set aside.
Make one (or both) of the Flavor Options.
BUTTERNUT SQUASH AND SWISS CHARD - In a large skillet, heat the oil over medium-high heat. Add the squash and sauté for 7 to 8 minutes. Add the remaining ingredients and cook until the chard has wilted, about 2 minutes. Keep warm.
PORTOBELLO MUSHROOM AND RED PEPPER - In a medium skillet, heat 2 tablespoons of the oil over medium heat. Add the mushrooms in a single layer. Cover and cook for 4 minutes, then flip and cook for 2 minutes more. Add the bell pepper, cumin, salt, black pepper, chipotle powder, and remaining oil, if needed. Cook for 5 minutes or until vegetables are cooked through, stirring often. Garnish with the radish. Keep warm.
To assemble, warm the tortillas on a baking sheet in a 350°F oven or in a dry skillet on the stovetop over medium heat. Place the warm tortillas on a platter or on individual plates. Divide the millet among the tortillas. Top each with either the Butternut Squash and Swiss Chard or the Portobello Mushroom and Red Pepper mixture. Top with the cabbage, avo¬cado slices, scallions, and salt and pepper to taste. Finish with a dollop of the Cumin Cashew Cream Sauce and/or a drizzle of the Seriously Sensational Sriracha Sauce, if desired.