In a bowl, combine, chicken, lemon juice, lemon zest, garlic powder, salt, and pepper. Toss to coat.
Heat the grill pan with oil. Add the marinated chicken, cook until you see grill marks or until the internal temperature reaches 165ºF. Cool, cut into long strips, then cut into bite-sized pieces.
For the dressing: combine all dressing ingredients. Mix until well incorporated.
Assemble the salad. In a platter or clean bowl, add lettuce, avocado, tomato, boiled eggs, bacon, Colby jack cheese, and chicken. Drizzle the dressing, toss to coat. Serve.