Beat eggs, milk, salt and pepper in medium bowl until blended. Heat butter in large nonstick skillet over medium heat until hot. POUR IN egg mixture. … Continue cooking – pulling, lifting and folding eggs – until thickened and no visible liquid egg remains. Do not stir constantly.
Flip Mason jar lid over and gently remove it to release egg. Place egg on top of bacon and top with cheese slice. Close sandwich, wrap in aluminum foil, and return to the now-empty skillet. Let it warm up in the skillet for 2 minutes with the heat off, flipping occasionally.
Melt a nut size bit of butter in a small nonstick skillet over medium heat. Place the slice of bread and the round in skillet and toast lightly, about 1 minute. Crack the egg into the hole and season with salt and pepper, and cook until golden brown, about 2 minutes.