Craving a dinner that smells like a restaurant but requires zero culinary acrobatics?
You’re in luck. This Slow Cooker Mushroom Pork Tenderloin with Herb Butter does the heavy lifting while you pretend you planned this all along.
It’s cozy, hands-off, and perfect for weeknights or impressing guests who think slow cookers are just for chili. But here’s the catch!
A quick sear and a silky herb butter finish make it taste like you spent hours fussing—without actually doing that.
Contents
Equipment: Must-haves
- Slow cooker (crockpot) — the unsung hero
- Large skillet (preferably cast iron) — for searing
- Sharp knife
- Cutting board
- Tongs
- Meat thermometer
Equipment: Nice-to-haves
- Kitchen twine — for a neater roast (optional)
- Mixing bowl — to mix herb butter
- Spatula — for scraping browned bits
- Fine-mesh strainer — if you want a smoother sauce
Ingredients
- 1 pork tenderloin (about 1 to 1.25 lb)
- 8 oz cremini mushroom, sliced
- 1 small onion, thinly sliced
- 2 clove garlic, minced
- 1 tablespoon olive oil
- 4 tablespoon unsalted butter, softened
- 1 tablespoon fresh parsley, chopped
- 1 teaspoon fresh rosemary, chopped
- 1 teaspoon fresh thyme, chopped
- 1 cup low-sodium chicken broth
- 1 tablespoon Dijon mustard
- 1 tablespoon soy sauce
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 tablespoon cornstarch
- 2 tablespoon cold water
- 1 tablespoon lemon juice (optional, for brightness)
- Note: If you don’t have cremini mushroom, a white button mushroom or porcini will work—this recipe won’t judge.
Instructions
- Pat the pork tenderloin dry and season it with salt and pepper on all sides.
- Heat a skillet over medium-high heat and add the olive oil until shimmering.
- Sear the pork on all sides until golden brown to lock in juices, then transfer the pork to the slow cooker.
- In the same skillet, add a bit more oil if needed and sauté the sliced mushroom and onion until they start to brown and release their liquid.
- Add the minced garlic to the skillet and cook briefly until fragrant, then scrape the browned bits into the slow cooker over the pork.
- Whisk together the chicken broth, Dijon mustard, and soy sauce, then pour the mixture into the slow cooker to surround the pork.
- Cover and cook on low until the pork reaches the proper internal temperature, checking with a meat thermometer.
- While the pork cooks, make the herb butter by combining the softened butter with chopped parsley, rosemary, thyme, and a pinch of salt in a mixing bowl.
- When the pork is done, remove it from the slow cooker and tent it with foil to rest.
- If you want a thicker sauce, strain the juices into a saucepan and bring to a simmer; whisk the cornstarch with cold water and add it to the simmering sauce until it thickens.
- Slice the rested pork tenderloin into medallions and arrange on a serving platter.
- Spoon the mushroom-onion sauce over the pork and dot the medallions with the herb butter so it melts luxuriously over the warm meat.
- Finish with a squeeze of lemon juice if using, and serve immediately with your favorite side.
What Else You Should Know
Timing tip: Cook the pork on low for a more forgiving window and juicier results. Aim for an internal temperature of 145°F and let it rest; that’s the sweet spot for tender pork.
If you’re short on time, cooking on high works, but check the meat sooner to avoid overcooking. Herb butter is the secret handshake of this recipe.
Make it ahead and keep it chilled; it saves time and feels fancy when it melts over the warm pork. Variation idea: Swap the cremini mushroom for a single porcini for deeper flavor, or stir in a spoonful of cream to the sauce for extra silkiness.
Serving suggestion: Pair with roasted root vegetable or a single buttery mashed potato and a simple green to balance the plate. Leftovers store well in the fridge for up to three days and make an excellent sandwich filling—because nothing says ‘Monday lunch’ like reheated luxury.
Final reassurance: This recipe uses simple equipment and familiar ingredients, but delivers a dinner that feels celebratory. That’s why slow cooking is basically culinary alchemy—minus the robes.
