Begin by bringing a large pot of salted water to a boil over high heat. Add the medium pasta shells and cook according to the package instructions until al dente, about 8-10 minutes. Drain and set aside.

In a large skillet, heat a drizzle of oil over medium heat. Add the ground beef and cook for about 6-8 minutes until browned.

Add the diced onion to the pot with the beef and sauté for 3-4 minutes until translucent. Add the minced garlic and cook for 1 minute until fragrant.

Stir in the creamy tomato sauce, Italian seasoning, salt, and pepper. Let simmer for about 5 minutes over medium-low heat.

Add the cooked pasta shells into the pot with the creamy sauce and fold everything together. Stir until evenly coated and heated through, about 2-3 minutes.

Serve your Creamy Beef and Shells hot. Garnish with fresh herbs or grated cheese if desired.