Slice the chicken breast into thin strips and place them in a medium mixing bowl.
Add the lemon juice, dried oregano, garlic powder, ground cumin, sea salt, and black pepper to the chicken and toss until every piece is well-coated.
Heat the olive oil in a large non-stick skillet over medium-high heat.
Add the seasoned chicken to the skillet and sauté for 6 to 8 minutes, stirring occasionally, until the chicken is cooked through and the edges are golden and crispy.
In a small ramekin, whisk together the plain Greek yogurt and tahini with a teaspoon of water until the sauce reaches a smooth, drizzling consistency.
Assemble the bowl by placing the warm cooked quinoa at the base.
Top the quinoa with the crispy chicken strips, diced cucumber, halved cherry tomatoes, and thinly slivered red onion.
Drizzle the creamy tahini-yogurt sauce over the entire bowl and garnish with freshly chopped parsley before serving.