I used to think mushroom sauce was something you ordered with steak at a restaurant, not something worth making at home.
Then I realized it takes about 20 minutes and uses ingredients I usually already have in the kitchen.
This creamy garlic Parmesan mushroom sauce is rich, savory, and packed with sliced mushrooms, fresh thyme, garlic, and plenty of Parmesan.
Spoon it over chicken, steak, pork chops, or mashed potatoes, or stir it through pasta for a quick meatless dinner.
Ingredients You’ll Need
Mushrooms: Cremini mushrooms have a deeper flavor, but white button mushrooms also work well. Slice them evenly so they cook at the same rate.
Butter: Used to cook the mushrooms and adds richness to the sauce. You can replace half of it with olive oil if preferred.
Garlic: Fresh garlic gives the sauce its main savory flavor. Two or three cloves should be enough, depending on their size.
All-purpose flour: A small amount thickens the sauce and gives it a smooth consistency.
Chicken or vegetable broth: Loosens the sauce and adds more flavor. Use vegetable broth if you want to keep the recipe meatless.
Heavy cream: Creates the creamy base. Half-and-half can be used for a slightly lighter sauce, although it will not be quite as thick.
Parmesan cheese: Freshly grated Parmesan melts more smoothly than pre-shredded cheese and gives the sauce a salty, nutty flavor.
Fresh thyme: Thyme pairs especially well with mushrooms. Dried thyme can also be used, but you will need less.
Parsley: Adds a little freshness and color just before serving.
Salt and black pepper: Add these after the Parmesan, since the cheese and broth may already contain plenty of salt.
How to Make Mushroom Sauce
Cook the mushrooms. Melt the butter in a large skillet over medium-high heat. Add the sliced mushrooms and cook until they release their liquid, soften, and begin to brown.
Add the garlic and thyme. Reduce the heat to medium, then stir in the minced garlic and thyme. Cook for about 30 seconds, just until the garlic becomes fragrant.
Thicken the base. Sprinkle the flour over the mushrooms and stir well. Cook for about one minute to remove the raw flour taste.
Pour in the broth. Add the broth gradually while stirring, scraping up any browned bits from the bottom of the skillet. Let it simmer for a few minutes until it begins to thicken.
Make it creamy. Pour in the heavy cream and reduce the heat to low. Simmer gently until the sauce is smooth and thick enough to coat the back of a spoon.
Add the Parmesan. Stir in the freshly grated Parmesan until it has completely melted. Avoid boiling the sauce after adding the cheese, as high heat can make it grainy.
Season and serve. Taste the sauce before adding salt, then season with black pepper and more thyme if needed. Finish with fresh parsley and serve while warm.
Recipe Notes
Do not crowd the skillet. The mushrooms need enough room to brown. If the pan is too small, cook them in two batches so they do not steam.
Wait before adding salt. Salting mushrooms too early can draw out extra liquid and slow down browning. Season the sauce after adding the Parmesan and broth.
Use freshly grated Parmesan. Pre-shredded cheese often contains anti-caking ingredients that can prevent it from melting smoothly.
Keep the heat low after adding cream. A gentle simmer thickens the sauce without causing the cream to separate.
Adjust the consistency. If the sauce becomes too thick, stir in a little broth or cream. If it is too thin, let it simmer uncovered for a few more minutes.
Make it alcohol-free or add wine. The broth works perfectly on its own, but you can replace part of it with dry white wine. Let the wine simmer for a few minutes before adding the cream.
Store the leftovers properly. Keep the cooled sauce in an airtight container in the refrigerator for up to three days. Reheat it slowly over low heat, adding a splash of broth or cream if needed.
Avoid freezing it. Cream-based sauces can separate and become grainy after thawing, so this sauce is best made fresh or refrigerated for a few days.