Slice the chicken breast into thin bite-sized strips.
In a bowl, toss the chicken with cumin, smoked paprika, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sauté for 6 to 8 minutes until golden brown and fully cooked.
While the chicken cooks, dice the cucumber, cherry tomatoes, and red onion.
In a small bowl, stir together the Greek yogurt and lemon juice until smooth.
Place the warm cooked brown rice into a bowl and top with the spiced chicken and chopped vegetables.
Finish the dish by drizzling the zesty yogurt sauce over the top.