Season the chicken breast with salt, pepper, and a pinch of dried oregano.
Grill the chicken over medium-high heat for 6-7 minutes per side until the internal temperature reaches 165°F.
While the chicken is grilling, thoroughly rinse and drain the canned chickpeas.
Halve the cherry tomatoes and slice the cucumber into thin rounds or bite-sized pieces.
In a small jar or bowl, whisk together the olive oil and lemon juice with a pinch of salt to create a light vinaigrette.
Allow the grilled chicken to rest for 3 minutes before slicing it into thin strips.
Combine the mixed greens, chickpeas, tomatoes, and cucumber in a large salad bowl.
Drizzle the dressing over the vegetables and toss gently to coat.
Top the salad with the warm sliced chicken and serve immediately.