Slice the chicken breast into thin, bite-sized strips and place them in a medium mixing bowl.
Add the cumin, smoked paprika, turmeric, garlic powder, sea salt, and black pepper to the chicken, tossing well to ensure every piece is evenly coated.
Heat the extra virgin olive oil in a non-stick skillet over medium-high heat.
Add the seasoned chicken to the skillet and sear until golden brown and cooked through, approximately 6 to 8 minutes.
While the chicken cooks, dice the cucumber and halve the cherry tomatoes, then toss them in a small bowl with half of the lemon juice.
In a separate small ramekin, whisk together the plain Greek yogurt and the remaining lemon juice until smooth.
Place the warm cooked brown rice in the base of a serving bowl.
Top the rice with the spiced chicken, the cucumber and tomato salad, and the sliced avocado.
Drizzle the lemon-yogurt sauce over the top and serve immediately.