Spray four ramekins with cooking spray and set aside.
In a small bowl, whisk together the eggs, milk, salt, and pepper. Pour the mixture evenly into four ramekins. Wrap the ramekins tightly in foil.
Pour 1 ½ cups of water into the Instant Pot®.
Place the foil-wrapped ramekins into the Instant Pot®, stacked two by two. Close the lid and set the pressure release to Sealing.
Press Manual or Pressure Cook button and adjust time to 8 minutes.
While the eggs are cooking, toast the English muffins and spread with butter.
When the timer beeps, let the pressure release naturally for 2 minutes and then quick release the remaining pressure. Unlock the lid and remove it.
Carefully remove the ramekins from the Instant Pot®. Pour the water out of the cooking pot, then place the cooking pot back into the Instant Pot®.
Press the Sauté button and place the sausage patties inside the Instant Pot®. Heat the sausage patties, turning once, for about 1 minute. Remove from the Instant Pot®.
Remove each egg from its ramekin and place on one half of English muffin. Top each egg with a sausage patty and a slice of cheese. Place the other half of the English muffin on top to create a sandwich.