Creating Easy One Pot Creamy Tomato Pasta is straightforward with these simple steps:

1. Heat Oil: In a large pot or skillet, heat the olive oil over medium heat.
2. Sauté Onion: Add the chopped onion and cook until translucent, about 3-4 minutes.
3. Add Garlic: Stir in the minced garlic and sauté for an additional 30 seconds until fragrant.
4. Add Tomatoes: Pour in the diced tomatoes with their juice.
5. Stir in Pasta: Add the pasta, heavy cream, dried basil, salt, and pepper.
6. Add Water: Pour in 3 cups of water, ensuring the pasta is covered.
7. Cook: Bring the mixture to a boil. Reduce the heat and simmer uncovered, stirring occasionally for 10-12 minutes until the pasta is cooked and the sauce has thickened.
8. Stir in Cheese: If using, stir in the grated Parmesan cheese until melted and creamy.
9. Adjust Seasoning: Taste and adjust seasoning if necessary.
10. Garnish: Serve hot, garnished with fresh basil if desired.

These clear instructions will guide you in preparing this incredible dish effortlessly, ensuring you achieve a rich and creamy result every time.