Ingredients
Method
- Heat olive oil in a large Dutch oven over medium heat until shimmering. Add the diced onions and cook undisturbed for about 5 minutes until they begin to soften at the edges.
- Stir in the minced garlic, thyme, and red pepper flakes. Cook another minute until fragrant, then add the carrots, parsnips, and celery. Continue cooking for 6-8 minutes, stirring occasionally, until the onions are deeply golden and any liquid has evaporated from the pot.
- Pour in the vegetable broth, scraping up any browned bits from the bottom of the pot with a wooden spoon. Add the drained tomatoes, mushrooms, and potatoes. Bring to a rolling boil over high heat.
- Once boiling, reduce the heat to medium-low and let simmer uncovered for 25-30 minutes until the vegetables are tender when pierced with a fork. The soup should thicken slightly as it cooks.
- Taste and season generously with salt and pepper—the broth needs more seasoning than you might expect since you're using so much liquid. Add butter one tablespoon at a time, swirling to melt between additions for richness.
- Ladle into bowls and top with fresh parsley and Parmesan if desired. Serve immediately while hot.
Nutrition
Notes
This recipe lives in my rotation because I can throw it together with what's on hand and still get something that tastes intentional. The key is taking five extra minutes to caramelize the onions until they're really golden rather than just soft—that's where most of the flavor comes from. Keep a few carrots and parsnips on hand when they go on sale, and you've got your base ready any time.
I serve it with crusty bread or a handful of toasted croutons, but honestly, I often skip the garnish entirely because it's good enough to stand alone. Leftovers taste even better the next day once all the flavors have settled together in the fridge.