Preheat the oven to 450°F and grease a muffin baking pan with nonstick cooking spray or with butter, set aside.
Over medium high heat, cook your sausage in a large skillet, breaking it up with a wooden spoon until browned and cooked through. Drain sausage thoroughly.
In a large bowl mix together the bisquick, ⅔ cup milk and 1 tablespoon oil until well combined.
Stir the sausage, cheese and green onions into the bisquick mix. A spatula or your hands may be easier for this step.
Spoon mixture into your muffin tins, filling them to the top.
Bake for 18-22 minutes or until the toothpick comes out clean.
Let muffins cool in the pan for 5 minutes before transferring to a cooling rack. Serve warm.