Heat a large non stick or cast iron skillet over medium heat on the stove. Add Olive Oil (1 tablespoon). Once hot and shimmering, add in the Yellow Onion (1) and cook until it is translucent and soft. About 5 minutes.
Add in the Garlic (1 clove) and cook until fragrant about 30 seconds. Pull off the heat and allow to cool slightly.
In a medium bowl, combine the Ground Turkey (1 pound), Fresh Parsley (2 tablespoon), Egg (1), Panko Breadcrumbs (1 cup), and Grated Parmesan Cheese (1/4 cup). Add in Salt (1 teaspoon) and Ground Black Pepper (1/2 teaspoon). Toss in the onion/garlic mixture and combine with your hands.
Shape the mixture into patties and put them on a plate.
Heat the skillet over medium heat again with the additional Olive Oil (1 tablespoon). Once hot and shimmering place the patties in the skillet. Cook until browned on both sides. About 6 minutes per side.
Pull off the heat and serve on buns with Red Onion (to taste), Dill Pickle (to taste), Ketchup (to taste), Mayonnaise (to taste), Yellow Mustard (to taste), Lettuce (to taste), Heirloom Tomato (to taste), and Avocado (to taste).