Prepare the Smoky Lime Dressing : In a blending cup or small blender, combine the ⅓ cup olive oil, lime juice, maple syrup, minced garlic, cilantro, smoked paprika, cayenne, ½ teaspoon of the kosher salt, and ½ teaspoon of the black pepper. Blend until the mixture is smooth and emulsified. Set aside about ⅓ cup of the dressing for the final drizzle.
Ready the Grill : Preheat your grill or grill pan over medium heat, aiming for a surface temperature of about 375°F (190°C). Ensure the grates are clean.
Season the Vegetables : In a large bowl, toss the prepared zucchini, yellow squash, eggplant, red onion, and bell peppers with just enough olive oil to lightly coat them, then season with the remaining ¼ teaspoon kosher salt and ½ teaspoon black pepper.
Grill Until Tender-Charred : Arrange the seasoned vegetables on the hot grill in a single layer, working in batches if necessary. Grill for about 8 to 10 minutes, turning halfway through, until they are tender-crisp with distinct grill marks. Add the green onions to the grill during the last 3 to 4 minutes of cooking.
Chop & Dress : Remove all vegetables from the grill and let them cool slightly on a cutting board. Coarsely chop everything into bite-sized pieces. Transfer the chopped vegetables to a mixing bowl and toss with about half of the main dressing portion (not the reserved amount).
Assemble the Bowls : Add the cooked farro to a separate large bowl and toss with the remaining main portion of the dressing until well-coated. Divide the seasoned farro among six bowls. Top each with a generous portion of the grilled vegetables, black beans, diced avocado, and crumbled cotija cheese. Drizzle with the reserved dressing, sprinkle with toasted pepitas, and serve immediately with fresh lime wedges.