Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Rinse the chickpeas under cold water and pat them completely dry with a paper towel to ensure they get crispy.
Toss the chickpeas with half of the olive oil and the garlic powder, then spread them in a single layer on the baking sheet.
Roast the chickpeas for 20 to 25 minutes, shaking the pan halfway through, until they are golden and crunchy.
While chickpeas roast, season the turkey breast with a pinch of salt and pepper.
Grill the turkey breast over medium-high heat for about 5 to 6 minutes per side or until fully cooked through, then let it rest before slicing into thin strips.
In a small bowl, whisk together the remaining olive oil and lemon juice to create a simple vinaigrette.
Place the mixed greens in a large bowl and toss with the vinaigrette until lightly coated.
Top the greens with the sliced grilled turkey and the warm roasted chickpeas.