Best Substitutes for Portobello Mushrooms
Portobello mushrooms bring three key qualities to recipes: their meaty texture holds up to grilling and roasting, their large caps (4-6 inches across) work as vessels for stuffing, and their earthy flavor deepens when cooked. Each cap weighs about 3-4 ounces and has a firm, dense structure that won't fall apart under heat. The gills underneath are edible but can turn dishes dark brown, so many cooks scrape them out. When substituting, you need to match the size for stuffed applications or the texture for sliced uses. No substitute perfectly replicates portobello's combination of size and meatiness, but several come close depending on your recipe.
Best Overall Substitute
Cremini mushrooms at a 1:1 weight ratio. They're baby portobellos with the same earthy flavor and firm texture, just smaller. Use 4-6 cremini caps to replace one large portobello. They cook faster (8-10 minutes vs 12-15 for portobellos) but handle high heat just as well.
All Substitutes
Cremini mushrooms
4-6 medium caps per large portobello, or equal weightCremini are young portobellos with identical flavor and texture, just smaller. They have the same dense, meaty structure and earthy taste that intensifies when cooked. The caps are 2-3 inches across versus portobello's 4-6 inches, so you need multiple cremini to match the volume. They cook 3-5 minutes faster than portobellos because of their size. No flavor adjustment needed.
Large button mushrooms
6-8 large caps per portobello, or equal weightButton mushrooms are the youngest stage of the same species as portobellos. They have a milder flavor and softer texture when cooked. Each large button weighs about 0.5 ounces versus portobello's 3-4 ounces, so you need many more. They release more water during cooking (about 20% more moisture), which can make dishes slightly watery. Cook 2-3 minutes less than portobellos to prevent mushiness.
King oyster mushrooms
2-3 large stems per portobello capKing oyster stems have a dense, almost scallop-like texture when sliced thick and cooked. The stems are 4-6 inches long and 1-2 inches thick, giving good surface area for grilling or roasting. They hold their shape better than portobellos and have a mild, slightly sweet flavor. Score the surface in crosshatch patterns to help seasonings penetrate. Cook 10-12 minutes at 400F, same as portobellos.
Eggplant slices
1/2 inch thick slices, equal surface areaEggplant rounds cut 1/2 inch thick give similar size and heft to portobello caps. Salt the slices for 30 minutes and pat dry to remove bitterness and excess moisture. They absorb flavors well and develop a creamy interior with crispy edges when grilled or roasted. Cook 12-15 minutes at 425F, flipping once. The texture is softer than portobellos but still substantial enough for burgers or stuffing.
Cauliflower steaks
3/4 inch thick slices from center of headCauliflower steaks cut from the center of a large head give flat, wide pieces similar to portobello caps. Each steak weighs 4-5 ounces, slightly more than portobellos. They hold together when sliced properly and develop golden edges when roasted. The flavor is mild and nutty, not earthy like mushrooms. Brush with oil and season heavily since cauliflower is naturally bland. Roast 20-25 minutes at 425F.
Shiitake mushrooms
8-10 large caps per portobello, or equal weightShiitake caps have more intense, almost smoky flavor compared to portobellos. Remove the tough stems completely. Each cap is 2-3 inches across and has a firmer texture than button mushrooms but softer than portobellos. They cook quickly (5-7 minutes) and can become rubbery if overcooked. The strong umami flavor can overpower delicate dishes, so use less seasoning than you would with portobellos.
Zucchini rounds
1/2 to 3/4 inch thick slices, equal surface areaLarge zucchini sliced thick give similar diameter to portobello caps but much higher water content (95% vs 85%). Salt the rounds for 15 minutes and pat dry to remove excess moisture. They cook faster than any mushroom substitute (6-8 minutes) and have mild flavor that takes on seasonings well. The texture stays slightly crisp even when fully cooked. Choose zucchini that are 3-4 inches in diameter for best size match.
How to Adjust Your Recipe
When substituting smaller mushrooms for portobellos, increase surface area by cutting them in quarters or thick slices. This prevents overcooking. For stuffing applications, use multiple smaller caps or switch to vegetables like bell peppers or small eggplants that can hold filling.
Adjust cooking times down for most substitutes. Cremini cook 3-5 minutes faster, button mushrooms 2-3 minutes faster, shiitake 5-8 minutes faster than portobellos. Eggplant and cauliflower need similar or longer times.
Season more aggressively with milder substitutes like cauliflower or zucchini. They need extra salt, herbs, and spices to match portobello's natural earthiness. Shiitake needs less seasoning because of its stronger flavor.
When Not to Substitute
Portobello burgers need the exact size and structure of the caps. No substitute gives the same large, flat surface that fits burger buns properly. Classic stuffed portobello recipes depend on the natural bowl shape of the caps and their ability to hold 1/2 to 3/4 cup of filling without breaking.
Dishes that highlight mushroom flavor specifically won't work with non-mushroom substitutes like eggplant or cauliflower. The earthy, umami-rich taste of portobellos is central to these recipes. Grilled portobello steaks also need the specific texture and browning properties that only mushrooms provide.
Frequently Asked Questions
Can I use regular white mushrooms instead of portobellos?
Yes, use 8-10 large white button mushrooms (about 6-8 ounces total) to replace one portobello cap. White mushrooms are the same species but younger, so they have milder flavor and softer texture. They cook 2-3 minutes faster and release more water, so drain them if your dish gets too watery.
How do I make cremini mushrooms taste more like portobellos?
Cook cremini 2-3 minutes longer than usual to develop deeper flavor. Roast them at 425F for 10-12 minutes or saute over medium-high heat for 8-10 minutes until golden. The longer cooking concentrates their flavor and firms up the texture to match portobellos better.
What is the best non-mushroom substitute for portobello caps?
Eggplant rounds cut 1/2 inch thick work best. One medium eggplant (about 1 pound) yields 8-10 rounds that match portobello size. Salt them for 30 minutes first, then pat dry. They grill or roast in 12-15 minutes and absorb marinades well. The texture is creamier than mushrooms but still substantial.
Can I stuff other vegetables like I would portobello caps?
Large bell peppers work perfectly. Cut off tops and remove seeds to create a bowl that holds 3/4 to 1 cup of stuffing, same as portobello caps. Roast at 375F for 25-30 minutes. Small eggplants halved lengthwise also work well, holding about 1/2 cup stuffing each and cooking in 20-25 minutes.
How much liquid do different mushroom substitutes release?
Button mushrooms release the most water (about 20% more than portobellos), cremini about 10% more, and shiitake about the same amount. King oyster stems release 15% less water than portobellos. If your dish gets watery, cook the mushrooms separately first and drain before adding to the recipe.