Preheat your oven to 375°F (190°C). This will ensure that your chicken cooks evenly and thoroughly.
In a mixing bowl, combine the mayonnaise, sour cream, minced garlic, black pepper, and sea salt. Whisk until smooth and well combined.
Using a food processor or a zip-top bag, crush the Cool Ranch Doritos into fine crumbs. You want a texture similar to breadcrumbs for optimal coating.
Take each chicken breast and dip it into the creamy mixture, ensuring it’s completely covered. Then, coat the chicken in the crushed Doritos, pressing gently to adhere the crumbs.
Sprinkle the freshly shredded Parmesan cheese over the top of each coated chicken breast for an extra layer of flavor.
Place the coated chicken breasts in a greased baking dish. Bake in the preheated oven for 25-30 minutes, or until the chicken is fully cooked and the coating is golden brown.
Once cooked, remove the chicken from the oven and let it rest for a few minutes before serving. This will help retain the juices and ensure each bite is perfectly tender.