In a large bowl, crumble bacon into small bits. Add cold mashed potatoes, onion, garlic, beaten egg, cheddar (if using), flour, salt & pepper. Combine well. Using a large piece of waxed paper, form 16 patties. On top of each one, place one of the pork patties & then top each with the remaining potato patties. With a pair of scissors, cut waxed paper to separate filled potato pancakes so it will be easy for you to place them on a griddle for frying.