In a large mixing bowl, combine the lean ground turkey, minced onion, garlic powder, kosher salt, and chili powder. Use your hands to gently mix the ingredients, being careful not to overwork the meat to keep the patties tender.

Once the mixture is well combined, divide it into four equal portions. Gently shape each portion into a patty about ¾ inch thick. Make a slight indentation in the center of each patty using your thumb.

Place a large skillet or frying pan over medium heat and add a tablespoon of avocado or olive oil. Let the oil heat until it shimmers.

Carefully add the patties to the heated skillet. Using a greased spatula or burger smasher, gently smash each patty down to about ½ inch thick. Cook for 2-3 minutes until a golden-brown crust forms, then flip and cook for another 2-3 minutes.

While the patties are cooking, prepare the BBQ ranch sauce by combining ranch dressing and your favorite BBQ sauce in a small bowl. Stir well until thoroughly mixed.

Slice your hamburger buns in half and toast them in the skillet, cut side down, until golden brown.

To assemble your burgers, place a cooked patty on the bottom half of each toasted bun. Generously drizzle the BBQ ranch sauce over the patty, then add your desired toppings. Place the top bun on and serve.