One-pot spaghetti with simple tomato sauce is the kind of dinner that works when you are tired, the cupboard is mostly empty, and you still want something genuinely good on the table. The pasta cooks right in the sauce, so every strand absorbs the tomato flavor as it softens — and you only have one pot to wash afterward.
This recipe uses pantry staples most home cooks already have: dried spaghetti, canned crushed tomatoes, onion, garlic, and a handful of dried herbs. It takes about 25 minutes from start to finish, serves four, and costs very little per serving. No specialty ingredients, no complicated techniques — just dinner.
Why you will like this recipe
- One pot. The pasta and sauce cook together in the same pot — less washing up, less fuss.
- 25 minutes total. Five minutes of prep, twenty minutes of cooking. Faster than ordering takeout.
- Pantry-friendly. Uses canned crushed tomatoes, dried spaghetti, and dried herbs. Fresh onion and garlic add flavor; the remaining core ingredients are pantry staples (Parmesan is optional).
- Affordable. Simple, accessible ingredients keep the cost per serving low.
- Dual measurements. Every ingredient lists both US customary and metric amounts, so you can cook with confidence wherever you are.
- Practical substitutions included. Gluten-free pasta, whole peeled tomatoes instead of crushed, and vegetable or canola oil instead of olive oil — each swap is explained with notes on what changes.
What you need
Prep time: 5 minutes | Cook time: 20 minutes | Total time: 25 minutes | Servings: 4 | Difficulty: Easy
Equipment: One large pot or deep skillet (12 inches / 30 cm minimum), wooden spoon, measuring cups and spoons.
How to make it
One-Pot Spaghetti with Simple Tomato Sauce
Ingredients
Equipment
Method
- In a large pot or deep skillet, heat the olive oil over medium heat for about 30 seconds.
- Add the diced onion and cook, stirring occasionally, until softened and translucent, about 5 minutes. Adjust the heat if the onion starts to brown too quickly.
- Add the minced garlic and stir for 30 seconds, until fragrant. Do not let the garlic burn.
- Pour in the crushed tomatoes and water. Add the oregano, dried basil, salt, pepper, and sugar, then stir well.
- Break the spaghetti strands in half so they fit comfortably in the pot, then add them to the sauce.
- Bring the mixture to a boil over medium-high heat, stirring frequently. Reduce the heat to medium-low, partially cover, and simmer for 12–15 minutes, stirring every 2–3 minutes, until the spaghetti is al dente and the sauce has thickened.
- Taste and adjust the seasoning. If the sauce is too thick, add water 1/4 cup (60 ml) at a time. If it is too thin, simmer uncovered for another 2–3 minutes.
- Divide among bowls and top with grated Parmesan if using. Serve immediately.
Notes
Safe substitutions
| Ingredient | Substitute | Notes |
|---|---|---|
| Spaghetti | Gluten-free spaghetti, linguine, or fettuccine | Check pasta package for cook time — GF pasta may need 1-2 minutes less |
| Crushed tomatoes | 1 can (28 oz / 800 g) whole peeled tomatoes, blended smooth | Same quantity; texture will be slightly smoother |
| Dried basil | 1/4 cup fresh basil, torn (add as garnish after cooking) | Fresh basil loses its flavor if cooked for 15+ minutes; add raw at the end |
| Parmesan | Nutritional yeast (2 tbsp / 15 g) | For a dairy-free option; flavor is different but pleasant |
| Olive oil | Vegetable oil or canola oil | Neutral flavor; works fine |
Storage and reheating
- Refrigerate: Store leftovers in an airtight container for up to 4 days. Reheat in a pot over low heat with a splash of water (1/4 cup / 60 ml) to loosen the sauce. Microwaving works too — cover loosely and heat in 60-second bursts, stirring between.
- Freeze: Freeze in a sealed container for up to 2 months. Thaw overnight in the refrigerator before reheating. The pasta texture may be slightly softer after freezing.
Frequently asked questions
Can I use fresh tomatoes instead of canned?
Yes. Use about 2 lbs (900 g) of ripe fresh tomatoes, peeled and roughly chopped, instead of the 28 oz (800 g) can of crushed tomatoes. Simmer the sauce a few minutes longer to let the excess water evaporate. Fresh tomatoes will produce a lighter, brighter sauce than canned.
Do I have to break the spaghetti in half?
Breaking the spaghetti in half makes it easier to stir in a single pot, especially if your pot is wide rather than tall. If you prefer full-length spaghetti and have a deep pot, you can skip this step — but you may need to press the pasta down gently with tongs as it softens to submerge it in the sauce.
The sauce is too thick or too thin — what do I do?
If the sauce is too thick, add 1/4 cup (60 ml) of water at a time and stir. If it is too thin, simmer uncovered for another 2-3 minutes to let the excess liquid evaporate. The final consistency should coat the pasta strands without being watery.
Can I make this ahead of time?
Yes. This recipe reheats well and keeps for up to 4 days in the refrigerator. The pasta will absorb more sauce as it sits, so add a splash of water when reheating to bring it back to the right consistency.