Heat oil in a skillet, brown sausage. Remove to a bowl.
Add garlic to the remaining fat in the pan and brown for 30 seconds before adding the cabbage. Sauté for 3-5 minutes. Once it starts to cook down, add the sausage back to the pan. Add salt and red pepper flakes and cook for another 3-5 minutes, until the cabbage starts to brown and wilt.