Savory bacon & cheese stuffed French toast

rashers bacon

very thick-cut (about 1-inch or more is ideal) slices of day-old bread (I used this no-knead challah made with this filling)

about 2/3 cup shredded mozzarella cheese (or cheese of your choice -- I substituted a handful of shredded smoked Gouda; Gruyere would also work wonderfully)

egg

milk

grated Parmesan cheese

salt and pepper as desired

minced garlic

reserved bacon grease (from above), for frying

maple syrup for serving (optional, but I love it)