Ready to serve an appetizer that looks impressive but is surprisingly easy to make? This Mushroom and Onion Butter Board is a savory twist on the viral butter board trend, made richer and more flavorful with caramelized mushrooms, red onion, roasted garlic, and fresh herbs. It is simple enough for a casual get-together, yet beautiful enough to use as a centerpiece for a party spread.

This Mushroom and Onion Butter Board recipe is sponsored by Monterey Mushrooms.
Entertaining boards are always a favorite because they are inviting, easy to share, and perfect for guests who like to serve themselves. A well-styled board also adds instant visual appeal to the table, whether you are hosting a holiday gathering, game day party, dinner with friends, or a relaxed family celebration.
Another reason to love this mushroom butter board is that much of the prep can be done ahead of time. You can soften the butter, roast the garlic, chop the herbs, and prepare the mushrooms and onions before guests arrive. When it is time to serve, simply assemble the board and set out crostini, crackers, pretzels, or rolls for dipping and spreading.

If you are planning a party, don’t miss these fun entertaining ideas:
- Hazelnut Butter Board
- Parrot Fruit Tray
- Cobb Salad Board
- Charcuterie Board: Bloody Mary Bar

How to Make a Butter Board
A butter board is one of the easiest appetizer boards to customize. The base is softened, high-quality butter spread across a clean, food-safe board. From there, you can add savory, sweet, spicy, or herby toppings depending on the occasion and what you plan to serve with it.
For this mushroom and onion butter board, the flavor comes from caramelized red onion and Monterey Mushrooms High Vitamin D Sliced Baby Bellas. The mushrooms and onions cook down until tender and slightly caramelized, creating a rich topping that pairs beautifully with creamy butter. Roasted garlic adds depth, while rosemary, thyme, and chives bring freshness and color.
Here are a few other butter board topping ideas:
- Butter, roasted garlic, lemon, thyme, chives, red pepper flakes, spicy chili oil, and honey
- Butter, goat cheese, figs, strawberries, honey, cinnamon, and crushed walnuts
- Butter, fried garlic, steak seasoning, and fresh parsley
- Butter, bacon, sautéed mushrooms, sea salt, prosciutto, and chili-infused olive oil
Serve your butter board with toasted bread, crostini, crackers, pretzels, or your family’s favorite rolls. The key is to offer sturdy dippers that can scoop up the butter and toppings without breaking.
Ingredients for Mushroom and Onion Butter Board

- Monterey Mushrooms High Vitamin D Sliced Baby Bellas
- Red onion
- Roasted garlic
- Chives
- Thyme
- Rosemary
- High-quality butter
- Olive oil
- Salt and pepper
- Coarse sea salt
- Crostini bread for serving
How to Make This Mushroom and Onion Butter Board

Begin with a clean cutting board or any food-safe serving board. Spread softened butter evenly across the surface, leaving a small border around the edges for a clean presentation. This recipe uses two 8-ounce sticks of high-quality butter.

Next, caramelize the mushrooms and onions. Heat olive oil in a skillet over medium heat. Add the sliced red onion and Monterey Mushrooms High Vitamin D Sliced Baby Bellas, then season with a pinch of salt and pepper. Cook, stirring regularly, until the mixture is tender and slightly caramelized, about 15 minutes.

Spoon the warm caramelized mushroom and onion mixture over the butter. Spread it gently so every bite gets a balance of creamy butter, earthy mushrooms, and sweet onion.

Add pieces of roasted garlic over the top, then finish the board with fresh rosemary, thyme, and chives. Sprinkle with coarse sea salt just before serving for added texture and flavor.
More About Monterey Mushrooms
We are proud partners of Monterey Mushrooms. Their mushrooms are grown without additives, supplements, or chemicals used to manipulate nutrition. They continue to be innovative in the mushroom category and offer products designed for everyday cooking and entertaining.
Related: Podcast Episode 203: The Hottest Produce Item of 2022
Did you know? Most farmed mushrooms are grown indoors. Monterey Mushrooms teamed up with the U.S. Department of Agriculture to replicate vitamin D-rich sunlight indoors and created a line of mushrooms that produce and retain 50% of the recommended daily value of Vitamin D per serving, even after cooking.
Eating a dozen medium-sized Monterey Mushrooms “High Vitamin D” mushrooms provides a full day’s worth of vitamin D. That can be helpful because many modern lifestyles keep people indoors and away from sunlight, which is a common way the body receives vitamin D.
More Mushroom Recipes We Love
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Mushroom and Onion Butter Board
Ingredients
- 16 oz high-quality butter softened
- 16 oz Monterey Mushrooms High Vitamin D Sliced Baby Bellas
- 1 medium red onion julienned
- 3 T olive oil
- 1 bulb garlic roasted, about 15 cloves
- 0.5 oz rosemary
- 0.5 oz thyme
- 0.5 oz chives
- Salt and pepper, to taste
- Coarse sea salt, for topping
- Crostini bread, for serving
Instructions
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Place softened butter on a clean cutting board or other food-safe serving board. Spread it evenly across the board using the back of a spoon or an offset spatula.
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Heat olive oil in a skillet over medium heat. Add the red onion and mushrooms, then season with a pinch of salt and pepper. Cook, stirring regularly, until the mixture is tender and slightly caramelized, about 15 minutes.
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Spoon the caramelized mushroom and onion mixture over the butter.
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Add the roasted garlic pieces across the board.
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Top with fresh rosemary, thyme, chives, and coarse sea salt. Serve with crostini bread.
Nutrition
Nutrition information is automatically calculated and should be used only as an approximation.
Additional Info
