Heat olive oil in a large non-stick skillet over medium-high heat.
Add the ground chicken to the skillet, breaking it apart with a spatula as it cooks.
Season the chicken with oregano, garlic powder, onion powder, salt, and pepper.
Sauté until the chicken is browned and reaches an internal temperature of 165°F (74°C), approximately 8 to 10 minutes.
In a medium mixing bowl, combine the diced cucumber, cherry tomatoes, and red onion.
In a small bowl, whisk together the Greek yogurt, lemon juice, and minced garlic until smooth to create the tzatziki sauce.
Divide the cooked grains evenly into four meal prep containers or bowls.
Layer each bowl with a portion of the cooked chicken and the fresh vegetable mixture.
Top each portion with a dollop of the yogurt sauce and a sprinkle of crumbled feta cheese.