Preheat the oven to 425°F. Line a baking sheet with parchment paper or a baking mat.
Combine the broth and farro in a medium saucepan, cover, and bring to a boil over high heat. Reduce the heat to low and simmer until all the liquid is absorbed, about 20 minutes.
Meanwhile, in a large mixing bowl, toss the pumpkin, apples, onion, and garlic with the oil, sage, thyme, cinnamon, salt, and pepper. Spread in one layer onto the prepared baking sheet. Bake until browned and tender, 15-20 minutes.
While the vegetables are roasting, whisk all the dressing ingredients together.
In a big bowl, toss the faro, roasted vegetables, cranberries, and walnuts with the dressing. Top with pepitas upon serving.