Combine all ingredients in a large bowl. Use your hands to mash everything together.
Form 5 burger patties and set aside.
Heat a large frying pan to medium heat, melt a tbsp or more of butter and place the burgers in the pan(you can repeat steps if using a smaller pan).
Cook COVERED for 4min on the first side then flip, turn heat to low and cook for another 4-8min or until burgers are cooked through on the second side. (It's best to cook them low and slow after flipping if you have time!)
Remove from pan and serve hot with avocado slices and tomato(bruschetta topping in my previous recipe would be a great addition as well!!) Enjoy your Easy Keto Feta Cheese Burgers!