Slice the chicken breast into thin, bite-sized strips for even cooking.
In a medium bowl, whisk together 0.5 tablespoon of olive oil, cumin, smoked paprika, turmeric, garlic powder, sea salt, and black pepper.
Toss the chicken strips in the spice mixture until every piece is thoroughly coated.
Heat the remaining 0.5 tablespoon of olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sear for 6-8 minutes, turning occasionally, until golden brown and cooked through.
While the chicken cooks, stir together the Greek yogurt and lemon juice in a small bowl until the sauce is smooth and creamy.
Dice the cucumber and halve the cherry tomatoes into bite-sized pieces.
Place the warm cooked brown rice in a bowl and top with the spiced chicken, cucumber, and tomatoes.
Drizzle the lemon-yogurt sauce over the entire bowl and serve immediately.