Rinse the quinoa under cold water and combine with 0.5 cup water in a small saucepan.
Bring to a boil, then reduce heat to low, cover, and simmer for 12-15 minutes until water is absorbed and quinoa is fluffy.
While quinoa cooks, dice the chicken breast into bite-sized pieces and toss in a bowl with harissa paste, sea salt, and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sauté for 5-6 minutes until browned and cooked through.
Toss in the sliced red bell pepper and zucchini, sautéing for an additional 3-4 minutes until the vegetables are tender yet vibrant.
Fluff the quinoa with a fork and divide into serving bowls.
Top with the harissa chicken and vegetable mixture, a dollop of Greek yogurt, and a sprinkle of fresh parsley.