In a large skillet or Dutch oven, heat a drizzle of oil over medium-high heat. Add ground beef and chopped onion. Cook for 5-7 minutes, stirring until the beef is browned and the onion is soft.

Sprinkle ranch seasoning mix over the beef and onion, and pour in beef broth. Stir well and bring to a gentle simmer.

Add uncooked small pasta shells into the pot and ensure they are fully submerged. Bring to a boil, then reduce heat to low, cover, and simmer for 10-12 minutes.

After cooking, remove from heat and stir in shredded cheddar cheese until melted.

Spoon into serving dishes and garnish as desired. Serve hot.