Slow-Cooker Portobello Gravy Beef Brisket Step-by-step instructions

Before you start

Before you start, trim any excess fat from the brisket, leaving a thin layer to keep it moist. Thickly slice the portobello mushrooms, and have your minced garlic ready.

Measure out the brown gravy and cut the butter into small pats. No need to sear the meat—the slow cooker will do all the work. Set your slow cooker to low if you have 8 to 10 hours, or high for 4 to 5 hours.

Instructions

Layer and Go

1. 1Layer the Brisket
   Place the trimmed beef brisket flat into the bottom of the slow cooker. Spread the thickly sliced portobello mushrooms over the top, then sprinkle with the minced garlic.
   Look for The brisket should sit flat, with mushrooms and garlic evenly covering the surface.
   Tip For even cooking, choose a brisket that fits comfortably in the slow cooker without folding.
2. 2Add Gravy and Butter
   Pour the rich brown gravy over the meat and vegetables, ensuring the brisket is mostly submerged. Dot the top with the pats of unsalted butter.
   Look for The gravy should coat the brisket and mushrooms; the butter will melt into the sauce during cooking.
   Tip If the gravy doesn't cover the meat completely, add a little beef broth to help keep it moist.

At the end of this phase, the brisket is nestled in the slow cooker, topped with mushrooms, garlic, and a pour of rich brown gravy. The butter pats are melting into the sauce. The slow cooker is ready to turn on; the aroma of garlic and gravy will start to fill the kitchen as it heats.

Slow-Cook and Shred

3. 3Slow-Cook the Brisket
   Cover the slow cooker and cook on low for 8 to 10 hours, or on high for 4 to 5 hours, until the brisket is fork-tender and easily shreds. The meat should reach an internal temperature of at least 145°F (63°C) for safety, but for best tenderness, cook until it shreds easily. Let it rest for 3 minutes before slicing.
   Look for The meat should be fork-tender, and the gravy will be bubbling and aromatic.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Cooking on low yields the most tender results; resist the urge to lift the lid too often.
4. 4Shred the Beef
   Once the brisket is fully cooked, remove it from the slow cooker and place it on a cutting board. Let it rest for at least 3 minutes, then shred it with two forks, discarding any excess fat.
   Look for The meat should pull apart easily into juicy strands.
   Tip Resting the meat before shredding helps retain its juices.
5. 5Return to the Gravy
   Return the shredded beef to the slow cooker with the mushrooms and gravy. Stir gently to combine, allowing the meat to soak up the sauce for a few minutes before serving.
   Look for The beef should be well coated in the glossy gravy.
   Tip If the gravy seems thin, simmer on high with the lid off for a few minutes to reduce.

After hours of gentle cooking, the brisket is fork-tender and the gravy is bubbling. The mushrooms have softened and absorbed the savory liquid. Shred the beef and return it to the pot, where it soaks up the glossy sauce. The kitchen smells deeply of roasted meat and umami.

Serve and Enjoy

6. 6Serve the Brisket
   Spoon the hot brisket and mushrooms onto toasted brioche slider buns or over mashed potatoes. Serve immediately, with extra gravy on the side if desired.
   Look for The brisket should be steaming and the gravy thick enough to coat a spoon.
   Tip For a low-carb option, serve over cauliflower mash or roasted vegetables.

The shredded brisket is piled onto toasted brioche buns, with mushrooms and a generous spoonful of gravy.

The meat is steaming, the gravy is thick and rich, and every bite is juicy and full of flavor. This is the payoff—a hearty, satisfying meal that came together with almost no effort.

Common mistakes

One common mistake is lifting the lid too often, which lets heat escape and extends cooking time. Another is using a lean cut of meat, which can become dry. Stick with brisket or another well-marbled cut.

Also, don't skip the resting step before shredding—this allows the juices to redistribute, keeping the meat moist. If the gravy is too thin at the end, simmer it on high with the lid off for a few minutes to reduce.

How to tell it’s done

The brisket is done when it is fork-tender and easily shreds. The internal temperature should be at least 145°F (63°C) for food safety, but for the best texture, cook until the meat pulls apart effortlessly—this usually means the temperature is higher, around 190°F (88°C).

The gravy should be bubbling and slightly thickened, and the mushrooms should be tender and soaked in the sauce.

• Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest