Begin by preheating your oven to 400°F (200°C), ensuring it's hot and ready for baking.
Take the chicken breasts and season both sides generously with garlic powder, salt, and black pepper.
In a skillet, heat 1 tablespoon of olive oil over medium heat until shimmering. Add the seasoned chicken breasts to the skillet. Cook for approximately 5-7 minutes on each side, or until the chicken is golden brown and thoroughly cooked (juices should run clear). Once done, remove the chicken from the skillet and allow it to rest for a few minutes before slicing into thin strips.
While the chicken is resting, prepare the avocado mixture. In a mixing bowl, combine the mashed avocado, diced tomatoes, finely chopped red onion, fresh lime juice, and a dash of salt and pepper. Stir well to blend the ingredients into a chunky and flavorful spread.
Line a baking sheet with parchment paper to prevent sticking. Arrange the slices of whole grain bread on the baking sheet.
Evenly distribute the prepared avocado mixture across each slice of bread, spreading it out to cover the surface completely.
Layer the sliced chicken over the avocado mixture for each sandwich. Follow this with a generous sprinkling of shredded mozzarella cheese on top of the chicken.
Drizzle the remaining tablespoon of olive oil over the assembled open-faced sandwiches to enhance richness and flavor.
Place the baking sheet in the preheated oven and bake for about 10-12 minutes, or until the cheese is melted, bubbly, and slightly golden on the edges.
Once out of the oven, garnish each sandwich with freshly chopped cilantro for a burst of color and flavor. Allow to cool for a few minutes before serving.
Serve the Chicken Avocado Melts warm and enjoy this delightful blend of flavors!