Heat oil in skillet over medium heat. Brown sausages.
When sausages links are half cooked through, slice them and return to pan to finish cooking. (Skip this step if you're using bulk sausage.)
Add garlic to pan. Stir.
Add onions. Sprinkle the seasoning over all. Cook, stirring, for a minute or two.
Add mushrooms. Cook, stirring occasionally, until almost cooked to your liking.
Add beans and continue to cook until heated through. Taste and add more seasoning if necessary.
To serve, garnish with chopped green onion, if desired.