Add ground pork, panko, fresh thyme, 3 tbsp of salt, and eggs to reserved onions and garlic in a medium mixing bowl. Mix all ingredients.
To test the seasoning, you can cook a small portion of the mixture in a pan before making the sliders. If more seasoning is required, add it in, mix, and repeat until you are satisfied.
Form the mixture into appropriate-size patties based on your bun size. Keep in mind, they will shrink about 10-20% depending on the moisture content of your mixture, so making them slightly larger is always a good idea.
These patties can be grilled, pan-fried, or baked. Whichever way you choose to cook them, add the mozzarella at the halfway point to ensure that it melts and the sliders do not overcook!