In a medium saucepan, bring the chicken broth to a boil. Add the orzo pasta and cook according to package instructions until al dente, about 8-10 minutes. Drain and set aside.
While the orzo is cooking, season the chicken breasts with salt and pepper. Heat olive oil in a skillet over medium heat. Add the chicken and cook for about 6-7 minutes on each side, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C). Remove from heat and allow to rest before slicing.
In a large bowl, combine the halved cherry tomatoes, diced cucumber, and chopped red onion. Drizzle with lemon juice and a pinch of salt and pepper, tossing to combine.
To assemble the power bowls, divide the cooked orzo among bowls. Top with baby spinach, sliced chicken, the tomato-cucumber mixture, and avocado slices.
Garnish with fresh herbs and a drizzle of olive oil if desired. Serve warm or at room temperature.
Notes
Serve warm or at room temperature. Adjust seasoning to taste.