Spray a small frying pan with low calorie cooking spray and set on a medium heat. Add the bacon and onion and fry for 4-5 minutes until softened and lightly browned. Set aside to cool.
To a bowl add the beef, onion, garlic, salt, pepper and hot sauce. Add the egg a little at a time until the beef mixture comes together. You might not need all the egg. We find it easier to mix the burger mixture together with our hands.
Once the onion and bacon mixture is cooled, add the grated cheese and mix well.
Split the burger mix into 4 equal balls, then put one ball into the burger press (if using), replace the lid and press down firmly – you should now have a thin burger in the press. Make an indent in the middle of the burger, then add half of the cheese and bacon mixture.
Take another ball of burger mix and flatten it slightly. Place it on top of the cheese mix, then replace the lid and press down firmly. Remove the burger from the press and repeat with the remaining burger mix and cheese filling.
You should now have 2 burgers. Place in the fridge to firm up for 30 minutes.
Spray a griddle pan with low-calorie cooking spray and set on a medium heat. Add the burgers and spray the tops with low-calorie cooking spray. Cook for 5 minutes, then turn and cook for another 5 minutes. The burgers should be browned on the outside and cooked through, the internal temperature should reach 65-75°C.
Serve on a roll with salad and a side of your choice!