Slice the chicken breast into thin, bite-sized strips and place them in a small mixing bowl.
Toss the chicken with the dried oregano, garlic powder, cumin, smoked paprika, sea salt, and black pepper until evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and cook for 5-7 minutes, stirring occasionally, until the edges are golden brown and crispy.
While the chicken cooks, whisk together the tahini and lemon juice in a small ramekin, adding a teaspoon of warm water at a time until it reaches a pourable consistency.
Prepare the bowl by placing the baby spinach and cooked quinoa at the base.
Top the greens and grains with the diced cucumber, halved cherry tomatoes, and the warm crispy chicken.
Finish the dish by drizzling the lemon-tahini sauce over the top and serve immediately.