1. 1. Brown the Mushrooms (Crucial Step!): Heat the olive oil and butter in a large, heavy-bottomed pot or Dutch oven (at least 5-6 quart capacity with a lid) over medium-high heat. Once the butter is melted and the oil is shimmering, add the sliced mushrooms in a single layer, working in batches if necessary to avoid overcrowding the pan.

      • • Cook the mushrooms undisturbed for 3-5 minutes per side, until they are deeply browned and have released their liquid, which then evaporates. Proper browning is key to developing intense umami flavor. Don’t rush this step!
      • • Once browned, remove the mushrooms from the pot with a slotted spoon and set them aside in a bowl.

1. 1. Sauté Aromatics: To the same pot (add a touch more oil if it looks dry), add the chopped yellow onion. Sauté over medium heat for 5-7 minutes, or until softened and translucent, scraping up any browned bits (fond) from the bottom of the pot – this is pure flavor!

1. 1. Add Garlic and Thyme: Add the minced garlic and dried thyme (or fresh thyme leaves) to the pot. Cook for another 1-2 minutes, stirring constantly, until fragrant. Be careful not to burn the garlic.

Part 2: Build the Savory Sauce & Cook Noodles

1. 1. Create the Roux: Sprinkle the all-purpose flour over the cooked onions and garlic. Cook, stirring constantly, for 1-2 minutes. This cooks out the raw flour taste and helps thicken the sauce.

1. 1. Deglaze and Add Liquids: Gradually whisk in about 1 cup of the vegetable broth, scraping the bottom of the pot to loosen any remaining browned bits. Once smooth, slowly whisk in the remaining vegetable broth, soy sauce (or tamari), and Dijon mustard.

1. 1. Season and Simmer Base: Stir in the smoked paprika (if using) and freshly ground black pepper. Bring the sauce to a gentle simmer, stirring occasionally. Taste and add salt if needed (remember mushrooms will be added back).

1. 1. Add Noodles and Mushrooms: Add the uncooked egg noodles (or other pasta) and the previously browned mushrooms (along with any accumulated juices) to the simmering sauce. Stir well to ensure the noodles are mostly submerged.

1. 1. Cover and Cook Noodles: Bring the mixture back to a gentle simmer. Reduce the heat to medium-low, cover the pot tightly with a lid, and cook for 8-12 minutes, or until the noodles are al dente (tender but still with a slight bite). The exact time will depend on the type and thickness of your noodles – check package directions as a guide, but start checking a minute or two early. Stir once or twice during cooking to prevent sticking, but try not to lift the lid too often.

      • • If the sauce seems to be thickening too much before the noodles are cooked, add a splash more vegetable broth or water.

Part 3: Finish with Creaminess & Serve

1. 1. Stir in Sour Cream (or alternative): Once the noodles are cooked and the sauce has thickened nicely, remove the pot from the heat. Let it sit for a minute or two.

      • • Stir in the sour cream (or Greek yogurt/vegan alternative) until it’s well combined and the sauce is creamy. Do not return the pot to high heat after adding sour cream, as it can curdle (especially lower-fat versions). If you need to gently rewarm, do so over very low heat.

1. 1. Adjust Seasoning: Taste the stroganoff and adjust seasonings as needed – more salt, pepper, or even a tiny splash more soy sauce for umami.

1. 1. Garnish and Serve: Ladle the One-Pot Vegetarian Mushroom Stroganoff into bowls. Garnish generously with chopped fresh parsley and extra fresh thyme leaves, if desired. Serve immediately.