Add oil to skillet, fry sausage until almost done. Toss in onion and garlic. Fry until onions are translucent. Add Rotel and cilantro stems to skillet. Cook for about a minute or so. Add Velveeta, cumin and cayenne pepper. Simmer for 8-10 minutes until cheese has melted and bubbly. If too thick, add a little milk. Serve with seasoned fried tortilla chips. Enjoy!