Preheat oven to 400F. Add diced zucchini, diced red onion and cherry tomatoes to a large mixing bowl and toss with 1 tbsp of oil and salt and pepper. Pour veggies onto a parchment lined baking sheet.
Bake at 400F for 20 minutes. While the vegetables bake boil 2 cups of water. Once the water is boiling add 1 and 1/2 cups pearl couscous to the pot. Reduce to low hear and cover. Simmer until all of the water is absorbed and the Israeli couscous is cooked through.
Allow the veggies and couscous to cool slightly. Add them both to a large mixing bowl with crumbled feta, chopped parsley, 1 tbsp oil and vinegar and toss to combine.