Grilled Chicken Salad + Homemade Sweet Onion Dressing

Name: Grilled Chicken Salad + Homemade Sweet Onion Dressing
Cuisine: American
Ingredients: 4 boneless skinless chicken fillets, about 5 oz each; 1 Tbsp avocado oil, or olive oil; 8 packed cups mixed lettuce leaves; 1 cup cooked fresh or thawed frozen organic corn kernels; 1.5 cups halved cherry tomatoes; 1/3 cup chopped pecans; 4 hard-boiled eggs, peeled and chopped; 1 ripe avocado, diced; 2 fresh garlic cloves, pressed; 1 small sweet onion, chopped; 4 Tbsps extra virgin olive oil, divided; 1/4 cup apple cider vinegar; 1/2 a fresh lemon, juiced; sea salt and freshly ground pepper