01 - Preheat oven to 425°F and line a baking sheet with parchment paper.
02 - Toss zucchini and red bell pepper with a drizzle of olive oil, salt, and pepper. Spread in a single layer on the baking sheet and roast for 20–25 minutes, tossing halfway, until golden and tender.
03 - Rinse farro under cold water. In a medium saucepan, combine farro, water or broth, and ½ teaspoon salt. Bring to a boil, reduce heat to simmer, cover, and cook for 20–25 minutes or until farro is tender but still chewy. Drain excess liquid if necessary.
04 - In a small bowl, whisk together olive oil, lemon juice, oregano, garlic, Dijon mustard, salt, and pepper to make the dressing.
05 - In a large mixing bowl, combine cooked farro, roasted zucchini and bell pepper, cherry tomatoes, red onion, and spinach. Pour dressing over and toss to combine.
06 - Divide the mixture among bowls. Top with feta, olives, and parsley. Serve warm or at room temperature.