Set to sauté high.
Add sausage to the cooker. Break the sausage into small bite size pieces. Cook for 5-8 minutes or until no longer pink.
Add butter and wait until it has completely melted.
Sprinkle 2 tbsp flour and mix until the meat absorbs all the flour. Repeat with the rest of the flour (~2 tbsp).
Pour ½ cup of milk at a time into the flour mixture and stir constantly (make sure to follow this step to prevent clumps forming in the gravy).
Stir the gravy frequently as you cook for 8-10 minutes or until it thickens to your desired consistency. Season with salt and pepper to taste. (If the gravy gets to thick: quickly add another ½ cup milk and repeat this step as needed).