Craving a hands-off dinner that still tastes like you slaved over it?
This slow cooker pork tenderloin with mushroom and rosemary is your new secret weapon. It’s comfort food with the dignity of a dinner party.
But here’s the catch! You get rich, savory flavor without babysitting the stove.
That’s why this recipe is perfect for busy nights, impressing guests, or pretending you planned ahead.
Contents
Equipment: Must-haves
- Slow cooker (insert your favorite cozy vessel)
- Skillet (for searing and sautéing)
- Cutting board
- Sharp knife
- Tongs
- Mixing bowl (for slurry)
- Wooden spoon
Equipment: Nice-to-haves
- Meat thermometer
- Slow cooker trivet
- Ladle
- Small whisk (for gravy)
- Cast iron skillet (for extra crust if you’re feeling fancy)
Ingredients
- 1 pork tenderloin (about 1 to 1.5 pound)
- 2 cup mushroom, sliced (use cremini or button mushroom)
- 1 medium onion, thinly sliced
- 3 clove garlic, smashed
- 1 fresh rosemary sprig
- 1 cup chicken broth (low-sodium if you care about your heart)
- 1 tablespoon Dijon mustard
- 1 tablespoon balsamic vinegar
- 1 tablespoon olive oil
- 1 tablespoon butter
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 tablespoon cornstarch
- 2 tablespoon cold water (for slurry)
- Optional: 1 teaspoon fresh thyme leaves (for extra herbiness)
Instructions
- Pat the pork tenderloin dry and season all over with salt and pepper.
- Heat a skillet over medium-high heat and add olive oil and butter until shimmering.
- Sear the pork on all sides until golden brown to lock in juices and get that lovely crust.
- Transfer the pork to the slow cooker, placing it on a trivet if you want neater juices.
- In the same skillet, add sliced onion and mushroom and sauté until they start to soften and pick up fond.
- Add smashed garlic to the skillet and cook briefly until fragrant but not burnt.
- Stir Dijon mustard and balsamic vinegar into the skillet to deglaze, scraping up browned bits from the pan.
- Pour chicken broth into the skillet, give it a quick stir, and then pour the flavorful liquid and vegetables over the pork in the slow cooker.
- Tuck the fresh rosemary sprig alongside the pork and add thyme if using.
- Cover and cook on low until the pork reaches a safe internal temperature and is tender.
- Remove the pork from the slow cooker and tent loosely with foil to rest while you make the sauce.
- Strain or skim the cooking liquid into a skillet and bring to a gentle simmer over medium heat.
- Whisk cornstarch with cold water in a mixing bowl to make a smooth slurry.
- Slowly whisk the slurry into the simmering cooking liquid until the sauce thickens to a glossy consistency.
- Slice the rested pork into medallions against the grain for tender bites.
- Spoon the mushroom and rosemary gravy over the pork and garnish with a small rosemary sprig or thyme leaves.
- Serve with mashed potato, roasted vegetable, or a crusty bread to soak up every drop.
What Else You Should Know
Tip: Searing the pork first gives you color and flavor. It’s worth the two extra minutes.
Timing: Cooking on low gives the best texture for tenderloin. If you’re short on time, cook on high but check earlier.
Thickening: Use the cornstarch slurry to turn broth into a silky gravy. Add it gradually so the sauce doesn’t go gluey.
Flavor swap: Swap balsamic for red wine vinegar if you want a brighter tang. That’s why substitutions are your kitchen superpower.
Storage: Store leftovers in an airtight container in the fridge and eat within three days. Reheat gently so the pork stays juicy.
Variation: Add a splash of cream to the finished sauce for a richer gravy. Or toss in baby carrot for sweetness.
Serving suggestion: Serve sliced pork over mashed potato or buttered noodle and ladle extra mushroom-rosemary sauce on top. Carb mop?
Yes please. Pro tip: Use a meat thermometer for perfect doneness.
Aim for just shy of the recommended max and let carryover heat finish the job. Final note: This recipe is cozy, forgiving, and smells like you planned ahead.
If dinner could wear a sweater, this would be it.
