Slice the chicken breast into thin, bite-sized strips and place them in a bowl. Toss thoroughly with the cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until evenly coated.
Heat the extra virgin olive oil in a large non-stick skillet over medium-high heat. Once shimmering, add the chicken strips in a single layer and sear for 5-6 minutes, turning occasionally until golden brown and cooked through.
While the chicken cooks, prepare the sauce by whisking the plain Greek yogurt, tahini, and fresh lemon juice in a small ramekin until the texture is velvety and smooth.
In a small mixing bowl, toss the diced cucumber, diced tomato, and minced red onion together to create a bright, refreshing Mediterranean-style relish.
To assemble, scoop the warm cooked basmati rice into a wide bowl. Arrange the spiced chicken and the fresh vegetable salad side-by-side on top of the rice.
Finish the dish by drizzling the creamy yogurt-tahini sauce over the chicken and vegetables for a burst of zesty flavor in every bite.