Keto Buttery Slow-Cooker Mushrooms let whole cremini mushrooms simmer low and slow in butter, dry ranch dressing mix, and grated Parmesan until they're silky and deeply savory. Four hours in the slow cooker turns three ingredients into a glossy, rich side that tastes like a steakhouse classic. A shower of fresh parsley keeps it bright at 36.1 g of fat per serving.
I’m always on the hunt for that perfect “set it and forget it” side dish, especially on those days when I just don’t have the energy to babysit the stove. This Keto Buttery Slow-Cooker Mushrooms recipe has quickly become a staple in my kitchen because it transforms simple ingredients into something that tastes like a high-end steakhouse side. It’s rich, savory, and requires almost zero effort—just toss everything in, let the slow cooker do the heavy lifting, and come back to a delicious, low-carb treat that pairs perfectly with just about anything.
Ingredients
• 6 tbsp / 85g (3 oz) unsalted butter
• 1 tbsp / 10g packaged dry ranch-dressing mix
• 8 oz / 227g fresh cremini mushrooms, whole
• 2 tbsp / 14g (0.49 oz) grated Parmesan cheese
• 1 tbsp / 3g (0.11 oz) chopped fresh flat-leaf Italian parsley
Instructions
1. Directions
2. With the crock insert in place, preheat your slow cooker to the Low setting.
3. Place 6 tbsp / 85g (3 oz) of butter and 1 tbsp / 10g (0.35 oz) of dry ranch dressing mix into the bottom of the slow cooker. Allow the butter to melt slightly, then stir to blend.
4. Add 8 oz / 227g of fresh mushrooms to the slow cooker. Stir gently to ensure the mushrooms are thoroughly coated with the butter-dressing mixture.
5. Sprinkle the top evenly with 2 tbsp / 14g (0.49 oz) of grated Parmesan cheese.
6. Cover with the lid and cook on Low for 4 hours.
7. Use a slotted spoon to transfer the mushrooms to a serving dish, leaving excess liquid behind if desired.
8. Top with 1 tbsp (15 ml) of chopped fresh parsley and serve warm.
Nutritional Information
• (Per Serving)
• Calories: 365 kcal
• Total Fat: 36.1g
• Saturated Fat: 22.8g
• Cholesterol: 95mg
• Sodium: 560mg
• Total Carbohydrates: 6.2g (0.22 oz)
• Dietary Fiber: 1.1g
• Protein: 5.1g
Pro Tips
• Clean mushrooms with a damp paper towel, not by soaking them. They act like sponges and will get soggy, preventing them from absorbing the buttery sauce.
• Use unsalted butter. Ranch dressing mix and Parmesan cheese are both very salty, so it’s best to control the sodium and add more salt at the end only if needed.
• Don’t be alarmed by excess liquid in the slow cooker. Mushrooms release a lot of water, which creates a delicious jus perfect for pouring over steak or cauliflower mash.
• No time for the slow cooker? Sauté everything in a skillet over medium heat for 15–20 minutes until the mushrooms are tender. Stir in the Parmesan just before serving.
FAQ
Q: Can I make these mushrooms on the stovetop instead
A: Yes, if you don’t have time for the slow cooker, you can sauté everything in a skillet. Cook over medium heat for 15–20 minutes until the mushrooms are tender, then stir in the Parmesan cheese just before serving.
Q: Why are my slow cooker mushrooms so watery
A: Mushrooms naturally release a lot of water as they cook, which is normal for this recipe. This excess liquid creates a flavorful jus that’s perfect for pouring over steak or cauliflower mash. Use a slotted spoon to serve the mushrooms if you prefer less liquid.
Q: What is the best way to clean mushrooms for this recipe
A: It’s best to clean mushrooms with a damp paper towel rather than soaking them in water. They are like sponges and will absorb the water, which can make them soggy and prevent them from soaking up the buttery sauce.
Q: Should I use salted or unsalted butter
A: The recipe specifically calls for unsalted butter. Both the packaged ranch dressing mix and the Parmesan cheese are quite salty, so using unsalted butter helps you control the overall sodium content of the dish.
Pro Tips
- Clean the mushrooms with a damp paper towel instead of soaking them — they act like sponges and will get soggy, preventing them from absorbing the butter sauce.
- Use unsalted butter: the ranch dressing mix and Parmesan cheese are both very salty, so unsalted butter lets you control the sodium and add more salt only if needed.
- Coat the mushrooms thoroughly in the butter-ranch mixture before sprinkling the Parmesan over the top so every mushroom cooks in the sauce.
- Don't be alarmed by excess liquid in the slow cooker — mushrooms release a lot of water, which creates a delicious jus perfect for pouring over steak or cauliflower mash.
- Use a slotted spoon to transfer the mushrooms to a serving dish, leaving excess liquid behind if you prefer, and top with the fresh parsley.
Frequently Asked Questions
Can I use a different kind of mushroom?
The recipe uses whole fresh cremini mushrooms, and similar mushrooms work as a swap. Keep them whole and uniform so they cook evenly in the slow cooker.
Why is there so much liquid in the slow cooker?
Mushrooms release their water as they cook — it mixes with the butter and ranch seasoning into a savory jus. Spoon it over steak or cauliflower mash rather than discarding it.
Is this mushroom dish keto-friendly?
Each of the 4 servings has about 6.2 g of carbs (1.1 g of that fiber) with 5.1 g of protein and 36.1 g of fat. Everything else in the pot is butter, cheese, and ranch seasoning.
How long do the mushrooms take?
Four hours on Low with the lid on — that gentle simmer is what lets the cremini soak up the butter-ranch sauce until silky.
Recipe card below.
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Keto Buttery Slow-Cooker Mushrooms
Ingredients
Method
- Directions
- With the crock insert in place, preheat your slow cooker to the Low setting.
- Place 6 tbsp / 85g (3 oz) of butter and 1 tbsp / 10g (0.35 oz) of dry ranch dressing mix into the bottom of the slow cooker. Allow the butter to melt slightly, then stir to blend.
- Add 8 oz / 227g of fresh mushrooms to the slow cooker.
- Stir gently to ensure the mushrooms are thoroughly coated with the butter-dressing mixture.
- Sprinkle the top evenly with 2 tbsp / 14g (0.49 oz) of grated Parmesan cheese.
- Cover with the lid and cook on Low for 4 hours.
- Use a slotted spoon to transfer the mushrooms to a serving dish, leaving excess liquid behind if desired.
- Top with 1 tbsp (15 ml) of chopped fresh parsley and serve warm.
- Don't be alarmed by excess liquid in the slow cooker. Mushrooms release a lot of water, which creates a delicious jus perfect for pouring over steak or cauliflower mash.
