Cook the whole wheat rotini pasta in boiling water according to package directions until al dente, then drain and rinse with cold water to stop the cooking process.
Season the chicken breast with sea salt, black pepper, and garlic powder.
Grill or pan-sear the chicken over medium-high heat until the internal temperature reaches 165 degrees Fahrenheit, then let it rest before slicing into bite-sized pieces.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, and dried oregano to create the dressing.
Halve the cherry tomatoes and dice the cucumber into small cubes.
In a large mixing bowl, combine the cooked pasta, sliced chicken, tomatoes, cucumber, and baby spinach.
Pour the dressing over the salad and toss thoroughly to ensure all ingredients are evenly coated.
Top with crumbled feta cheese and divide into meal prep containers for a ready-to-eat healthy lunch.