1. Combine the ground chicken, shredded cheddar cheese, ranch seasoning mix, breadcrumbs, egg, diced onion, and minced garlic in a large mixing bowl. Mix until well combined but avoid overworking the meat.
2. Season the mixture with salt and pepper to taste and gently mix again to evenly distribute the seasoning.
3. Divide the mixture into equal portions and form into patties about 1/2 inch thick.
4. Use your thumb to create a slight indentation in the center of each patty to ensure even cooking and prevent puffing up.
5. Preheat a large skillet or grill over medium heat and add a tablespoon of olive oil to prevent sticking and to enhance crispiness.
6. Place the patties onto the heated surface and cook for about 4-8 minutes per side, ensuring they reach an internal temperature of 165°F (74°C).
7. Prepare toasted buns and assemble the patties with your choice of toppings like lettuce, tomatoes, crispy bacon, jalapeños, avocado slices, pepper jack cheese, or ranch dressing.
8. Serve and enjoy your Cheddar Ranch Chicken Burgers with a side of your favorite condiments or dishes.