Season chicken breasts with salt, pepper, and cumin.
Grill the chicken over medium heat for about 6-7 minutes on each side.
Remove chicken from the grill and let it rest for a few minutes.
Combine lettuce, black beans, corn, and cherry tomatoes in a large bowl.
Dice the grilled chicken into bite-sized pieces.
Add diced chicken and avocado to the salad mixture.
Whisk together lime juice, salt, and pepper for the dressing.
Pour the dressing over the salad and toss gently to combine.
Garnish with chopped cilantro.
Serve immediately, optionally with tortilla chips.