In a large Dutch oven or deep skillet, brown the ground beef with the diced onions. Once the beef is cooked through, drain any excess grease. Add the minced garlic, smoked paprika, and oregano, sautéing for 60 seconds until fragrant.
Stir in the tomato sauce and the beef bone broth. Bring the mixture to a gentle boil.
Add the dry pasta shells directly into the bubbling sauce. Reduce the heat to medium-low, cover the pan, and simmer for 10–12 minutes. Stir occasionally to ensure the shells don't stick to the bottom. Cooking the pasta in the sauce allows the starch to naturally thicken the meal.
Once the pasta is tender and most of the liquid has been absorbed, turn the heat to low. Stir in the heavy cream and the shredded smoked cheddar.
Stir continuously until the cheese is completely melted and the sauce is glossy and thick. If the sauce is too thick, add a splash more broth.
Garnish with fresh parsley and a crack of black pepper.