Season the chicken breast evenly on both sides with the garlic powder, half of the sea salt, and half of the black pepper.
Heat a non-stick skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
While the chicken cooks, slice the English cucumber into thin half-moons and finely mince the shallot and fresh dill.
In a small glass jar or bowl, whisk together the extra virgin olive oil, lemon juice, and the remaining salt and pepper until emulsified.
Rinse and drain the chickpeas, then add them to a large mixing bowl with the sliced cucumbers, minced shallot, and fresh dill.
Pour the lemon vinaigrette over the cucumber mixture and toss gently to ensure every piece is coated.
Remove the chicken from the pan, let it rest for 3 minutes, then slice it into strips.
Plate the chilled cucumber salad and top with the warm sliced chicken to serve immediately.