Slow-Cooker Sour Cream Portobello Tenderloin Tips Tips, FAQ & printable recipe

Tips for success

For the best flavor, use full-fat sour cream—it adds richness and stability to the sauce. If you prefer a lighter version, you can use reduced-fat sour cream, but the sauce may be slightly thinner.

To thicken the sauce even more, stir in a cornstarch slurry (1 tablespoon cornstarch mixed with 2 tablespoons water) during the last 30 minutes of cooking. This is especially helpful if the sauce seems too thin after the beef has rested.

Don't be tempted to brown the beef first—this recipe relies on the slow cooker to develop flavor without extra steps. If you have time, searing the beef in a hot skillet adds a deeper color, but it's not necessary.

The portobello mushrooms are the key to the sauce's richness, so don't skimp on them. For a more pronounced mushroom flavor, you can add a teaspoon of dried porcini powder along with the gravy mix.

Variations

• Mushroom Medley: Replace the portobellos with a mix of cremini, oyster, and shiitake mushrooms for a more complex earthy flavor. Slice them thickly so they hold up during the long cooking time.
• Herb-Infused: Add 2 sprigs of fresh thyme and 1 bay leaf along with the gravy mix. Remove them before serving. The herbs add a subtle aromatic note that complements the beef and mushrooms.
• Red Wine Twist: Stir 1/2 cup of dry red wine into the sour cream mixture before adding it to the slow cooker. The wine adds depth and a slight fruity tang that pairs beautifully with the beef.
• Smoky Paprika: Add 1 teaspoon of smoked paprika along with the brown gravy mix. The smokiness enhances the savory flavor and gives the sauce a subtle warmth that's perfect for cooler days.

Storage and make-ahead

Fridge

Store leftovers in an airtight container in the refrigerator for up to 4 days.

Freezer

Freeze the cooled beef and sauce in a freezer-safe container for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheat

Reheat in a saucepan over medium-low heat, stirring occasionally, until hot and bubbling. Add a splash of beef broth or water to loosen the sauce if needed.

Cool the leftover beef and sauce to room temperature within 2 hours of cooking, then transfer to an airtight container. Refrigerate for up to 4 days. The sauce will thicken as it cools; reheat gently on the stovetop or in the microwave, adding a splash of beef broth or water to loosen it if needed.

You can assemble the raw ingredients in the slow cooker insert the night before, cover, and refrigerate. In the morning, place the insert in the slow cooker and cook as directed, adding about 30 minutes to the cooking time since you're starting from cold.

Alternatively, cook the full dish, let it cool, and refrigerate for up to 4 days. Reheat gently before serving.

Serving ideas

Serve the beef and sauce over warm buttered egg noodles for a classic stroganoff experience. The noodles soak up the creamy gravy, making every bite satisfying. You can also serve it over rice, mashed potatoes, or even crusty bread to mop up the sauce. A simple green salad or steamed broccoli on the side adds a fresh contrast.

For a more indulgent presentation, garnish with a sprinkle of fresh parsley or a few cracks of black pepper just before serving. This adds color and a hint of brightness.

If you like a bit of tang, a dollop of extra sour cream on top is a nice touch. The dish is hearty enough to stand alone, but it pairs well with roasted vegetables or a light cucumber salad.

Frequently asked questions

Recipe card

Slow-Cooker Sour Cream Portobello Tenderloin Tips

Prep 15 minCook 8 hTotal 8 h 15 minServes 6

Ingredients

• 2 lb beef tenderloin tips
• 8 oz portobello mushroom caps, thickly sliced
• 6 shallots, peeled and halved
• 1 cup sour cream
• 1 oz brown gravy mix (1 packet)
• 12 oz buttered egg noodles, cooked

Instructions

1. Place the beef tenderloin tips in the bottom of a 6-quart slow cooker. Scatter the thickly sliced portobello mushroom caps over the beef, then add the peeled and halved shallots. Spread the sour cream over the top, then sprinkle the brown gravy mix evenly over everything.
2. Cover the slow cooker and cook on low for 8 hours, or on high for 4 hours, until the beef is fork-tender and the sauce is bubbling and thickened. Let it rest for 3 minutes before slicing.
3. After cooking, check that the beef has reached at least 145°F (63°C) on an instant-read thermometer. Let the beef rest in the warm sauce for at least 3 minutes before serving.
4. Gently stir the sauce to combine the sour cream and gravy mix into a smooth, velvety gravy. The sauce should coat the back of a spoon.
5. Spoon the hot beef, mushrooms, and shallots over warm buttered egg noodles. Ladle extra gravy over each serving.

Contains: gluten, milk, eggs

Estimated nutrition per serving

Calories

520

Protein

38 g

Carbohydrates

32 g

Fat

26 g

Fiber

3 g

Sugar

6 g

Sodium

680 mg

Automatic estimate from the ingredient list, not laboratory-verified.