Preheat your oven to 400°F (200°C) for the chickpeas.
Drain and rinse the chickpeas, then pat them completely dry with a paper towel.
Toss the chickpeas with 1 teaspoon of the olive oil and a pinch of salt, then roast on a baking sheet for 20-25 minutes until crunchy.
While chickpeas roast, season the chicken breast with salt and pepper, and grill over medium-high heat for 6-7 minutes per side until cooked through.
In a small bowl, whisk together the remaining 1 tablespoon of olive oil, lemon juice, and a pinch of garlic powder to create the dressing.
Place the mixed greens in a large bowl and top with halved cherry tomatoes and sliced cucumbers.
Slice the grilled chicken into strips and the avocado into cubes.
Add the chicken, avocado, and roasted chickpeas to the salad bowl.
Drizzle the lemon vinaigrette over the top and toss gently to combine before serving.