I have made these a number of times and they are delicious (with some alterations):
OAMC Sausage Muffins
I usually add Garlic Powder, a bit of minced onion, a couple of drained cans of Green Chiles, extra seasonings (whatever I think sounds good from the spice rack) and I substitute the bulk breakfast sausage for a Vegetarian sausage (that's personal preference, but any kind of gourmet sausage that has been cooked and cut up would probably make these better than just using regular).
They're overall easy to make and very yummy
Half the recipe the first time you make them as it makes a lot!