Add the quinoa and water to a small pot on the stove. Bring to a boil, cover, and reduce to simmer for 10-15 minutes until the water has been absorbed. Remove from heat. Fluff gently with a fork, then cover and let sit for 10-15 minutes.

While the quinoa is cooling, start to prepare the veggies: Begin with the carrots, slicing them into rounds. Add to a large mixing bowl. Peel the cucumbers (if desired) and slice into rounds. Quarter each round and add to the bowl. Thinly slice the scallions and add to the bowl along with the broccoli florets. Halve each avocado, remove the pits, and cut into cubes. Scoop into the mixing bowl.

Once the quinoa has cooled slightly, add it to the mixing bowl along with desired protein (if using).

Whisk together all of the ingredients for the dressing. Pour over the quinoa and vegetables. Toss to combine. Transfer to bowls and serve.