Roasted Mushrooms with Garlic & Thyme

Name: Roasted Mushrooms with Garlic & Thyme
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Ingredients: 16 even-sized open cup mushrooms (about 1 1/2 pounds, stalks trimmed flush with the cap so each one sits flat); 3 tbsp olive or vegetable oil; 3 tbsp unsalted butter (softened); 2 cloves garlic (chopped very finely); 1/2 tsp garlic powder; 2 tbsp fresh thyme (chopped, or 2 teaspoons dried); 1 1/2 tbsp lemon juice; 5 tbsp fresh breadcrumbs (plain, or panko); salt and freshly ground black pepper to taste

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A great side dish no matter what you’re serving.

“I made this mushroom dish last night to have with breaded pan fried Red Snapper, steamed broccoli, cauliflower and carrots. This dish is divine. Will most definitely be making this again.”

Lynda Ryan

If I ever decided to make a list of “novels and foods I’d never get tired of,” there’s no doubt that The Lord of the Rings by J.R.R. Tolkien and Mushrooms would be on that list. You may be wandering where is the connection between Tolkien’s middle earth and mushrooms, well, for those that don’t know, mushrooms, in the world of Tolkien, are a Hobbit’s favorite treat, in particular of The Lord of the Rings’ protagonist, Frodo Baggins.I chose this interesting mushroom recipe to create a rustic side dish (which most likely eaten by hobbits) by lightly frying them and then roast them along with garlic, butter, fresh thyme, breadcrumbs and lemon at the end.I think mushrooms are good no matter how you cook them, they are an excellent source selenium as well as many other nutrients, but roasting concentrates the mushroom flavor in a way that makes these mushrooms especially good.
A word of advice though, you might want to double the recipe, as they’re likely to disappear quickly. And if you can’t get enough of that garlic flavor, you’ll want to try our Creamy Garlic Mushrooms too. Same cozy, garlicky comfort, but smothered in a rich, creamy sauce instead of roasted dry.

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★★★★★ 5 Star Review

“Made these last night with grilled rib eye and they were fantastic! Will definitely be in the rotation for weekly dishes.”
Heather

Which Side of the Mushroom Faces Up?

Rounded side down, hollow side up, the way you would set a bowl on the table. That is true in the skillet and it is true in the baking dish, and it never changes at any point in the recipe. The garlic butter needs somewhere to sit, and the hollow underside is that somewhere.

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The old wording said cap side down in one step and stalks facing upwards in the next, which are two ways of describing the same position. Written that way it reads as though something turns over in between. Nothing turns over.

Why You Sear the Caps Before They Go in the Oven

Because a mushroom is mostly water, and it has to come out somewhere. Two or three minutes in hot oil drives most of it off in the skillet, where it evaporates. Skip that and the same water comes out in the baking dish, where it has nowhere to go, and you end up with buttery breadcrumbs floating in a puddle.

It is one extra pan and it is the reason this version holds up on a table for an hour. If you want to save the washing up, use a skillet that can go in the oven and do both stages in it.

READER TIP
“I made it a one pan dish by cooking the caps in a stainless steel pan that went right into the oven. Next time I think I will mix the breadcrumbs into the softened butter and top with a sprinkle of Parmesan cheese.”
Candice

Can You Make These Ahead of Time?

Yes, and this is the question people ask about this recipe more than any other. Assemble them completely, garlic butter and breadcrumbs on, cover the dish and refrigerate for up to two days. Bake straight from the fridge and give them three or four extra minutes.

They also freeze, assembled and unbaked. Freeze them on a tray until solid, then bag them. They keep three months and go in the oven frozen, about 25 minutes. What does not work is freezing them after baking. A cooked mushroom that has been frozen turns to water on the plate.

And they do not need to be hot. These are as good at room temperature as they are straight out of the oven, which is the real reason they work for a party.

READER TIP
“An incredible hit with everyone. I agree with your suggestion, double it. I did but will definitely triple it next time. I love that they can be completely prepped and popped in the oven at the last minute.”
Kelly D’Angelo

Are Roasted Mushrooms a Good Thanksgiving Side Dish?

Yes, and the reason is the oven. These need fifteen minutes at 400 degrees F, and they can be sitting in the fridge fully assembled since the day before. On a day when the turkey owns the oven and every burner is spoken for, a side dish that needs one short window and no attention is worth more than one that tastes slightly better.

They also survive the part of Thanksgiving that ruins most sides, which is the forty minutes between when the food is ready and when everyone actually sits down. Mushrooms that have cooled to room temperature are still good. Mashed potatoes that have cooled are not.

Sixteen mushrooms feeds about eight people as one of several sides. For a bigger table, double it and use two dishes rather than crowding one, because caps packed against each other steam instead of browning.

What Mushrooms Should You Use?

Open cup mushrooms, sold as cremini or baby bella, about two inches across. Sixteen of those come to roughly 1 1/2 pounds, which is the number to buy by if your store sells them loose. White button mushrooms work and are cheaper, though they have less flavor and give up more water.

Look for caps that are closed underneath or only just opening. A mushroom whose gills are wide open and dark is older, and it will collapse rather than hold the butter. Wipe them with a damp paper towel instead of rinsing them. A mushroom under the tap behaves like a sponge, and a waterlogged cap will not brown no matter how long you sear it.

What If You Do Not Have Fresh Thyme?

Use 2 teaspoons of dried thyme in place of the 2 tablespoons fresh. Dried herbs are roughly three times as concentrated, so the swap is never one for one.

Oregano works and gives it a more Mediterranean turn. Rosemary works but it is much stronger, so use half as much or it takes over. Parsley on its own is too mild to carry the butter, though it is good scattered over the top at the end.

READER TIP
“Cut up your fresh herbs, combine them, and put them in ice cube trays topped with olive oil or melted butter. Cover with wax paper and freeze. Take out of the trays and put in freezer bags. Label them and use them on things like this.”
Glenda

What Can You Use Instead of Breadcrumbs?

Panko, and it is arguably better than the original. It stays crisper and browns more evenly, because the flakes are larger and drier.

Almond meal works and keeps the dish grain free, though it browns faster, so check at twelve minutes. Crushed pork rinds work for anyone eating low carb and crisp up beautifully. Plain or Italian seasoned crumbs are both fine, and if you use Italian, cut the thyme in half so the flavors do not fight.

A tablespoon of grated parmesan mixed into whichever crumb you choose is a good addition in every version.

Can You Make Them in an Air Fryer?

Yes, at 375 degrees F for about 10 minutes. Sear the caps in a skillet first exactly as written, then fill them and air fry in a single layer without stacking. The basket runs hotter and drier than an oven, so the breadcrumbs color faster and the caps hold their shape well.

Work in batches rather than crowding the basket. Air fryers brown by moving hot air, and packed food blocks the air.

Questions People Ask About Roasted Mushrooms

Can I serve them cold? Yes. They are equally good hot or at room temperature, so you can make them the night before a party or minutes before.

Do I have to remove the stalks? Trim them flush with the underside of the cap so the mushroom sits flat. You do not need to hollow anything out. Chop the trimmings and add them to the garlic butter if you do not want to waste them.

The garlic butter tastes strong to me. Halve the thyme or halve the lemon juice, but not both. The lemon is what stops three tablespoons of butter from tasting heavy, so it is doing more work than it looks like it is.

Can I add cheese? Yes. A sprinkle of parmesan over the breadcrumbs in the last five minutes is the easiest version. Mixing it into the crumbs before they go on works too.

How many does this feed? Sixteen mushrooms is about eight servings as a side, or four if they are the main event on toast.

A Note on This Recipe

The recipe itself is exactly what it always was. Same mushrooms, same garlic butter, same 400 degrees F for 15 minutes. Nothing about how it tastes has changed.

Updated September 2026: the two steps that said cap side down and then stalks facing upwards now say it once and plainly, because those are the same position and readers asked about it twice, nine years apart. The garlic powder was in the ingredient list without ever appearing in a step, and now it goes into the garlic butter where it belongs. The 16 mushrooms have a weight next to them at last. Thank you to Carolyn and Carole, who both spotted the wording, and to L Dienel, who asked what 16 mushrooms actually weigh.