Slow-Cooker Monterey Jack Skirt Steak Fajitas Step-by-step instructions

Before you start

Before starting, slice the skirt steak against the grain into thin strips, about 2 inches long. This helps the meat break down evenly during cooking. Measure out the tomatoes, jalapeños, sour cream, and cheese so everything is ready to layer.

No need to pre-cook anything — the slow cooker handles it all. Have your slow cooker clean and ready, and set out the lid. If you plan to serve with tortillas, warm them just before the meat is done.

Instructions

Layer and Cover

1. 1Layer the Raw Ingredients
   Place the sliced skirt steak strips in the bottom of a 6-quart slow cooker. Pour the fire-roasted diced tomatoes with green chiles and the sliced pickled jalapeños over the meat. Spread them evenly over the steak.
   Look for The steak is covered with tomatoes and jalapeños.
   Tip No need to stir; the layers will meld as they cook.
2. 2Add the Creamy Toppings
   Dollop the sour cream over the tomato mixture, then sprinkle the shredded Monterey Jack cheese evenly over the top. Do not stir. Cover the slow cooker with the lid.
   Look for The cheese forms a blanket over the top.
   Tip Stirring now is unnecessary; the heat will blend everything.

After this phase, the slow cooker contains raw steak strips topped with tomatoes, jalapeños, sour cream, and cheese. The ingredients are in distinct layers, with the cheese forming a white blanket over the colorful mixture.

It looks like a casserole ready to bake. No stirring has occurred, and the slow cooker is covered and set to low. The kitchen smells fresh and slightly tangy from the pickled jalapeños.

Slow-Cook to Tender

3. 3Slow-Cook on Low
   Set the slow cooker to low and cook for 6 to 8 hours, until the steak is fork-tender and easily shreds. The sauce will be bubbling and the cheese fully melted. Let it rest for 3 minutes before slicing.
   Look for The sauce is thick and bubbling, and the steak shreds easily.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Cooking on low keeps the steak tender; high heat can toughen it.
4. 4Check the Temperature
   After 6 hours, check the internal temperature of the steak with an instant-read thermometer. It should read at least 145°F (63°C). If not, continue cooking and check again after 30 minutes.
   Look for Thermometer reads 145°F (63°C) or higher.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip For extra tenderness, let the steak rest 5 minutes before serving.
5. 5Rest the Meat
   Once the steak reaches temperature, turn off the slow cooker and let the meat rest in the sauce for at least 3 minutes. This allows the juices to redistribute.
   Look for The meat has rested and the sauce is settled.
   Tip Resting is key for juicy steak.

After 6 to 8 hours on low, the slow cooker is bubbling gently. The cheese has melted into the sauce, which is now a warm orange-brown color with flecks of green chiles. The steak strips are deep brown and tender, breaking apart with a fork. The aroma is rich, beefy, and slightly spicy. The sauce has thickened and coats the meat. The internal temperature of the steak reads at least 145°F (63°C).

Shred and Serve

6. 6Shred or Slice the Steak
   Using tongs or two forks, transfer the steak strips to a cutting board. Shred or slice into bite-sized pieces. Return the meat to the slow cooker and stir gently into the sauce.
   Look for The steak is shredded and coated with the creamy sauce.
   Tip Shredding makes it easier to pile onto tortillas.
7. 7Warm the Tortillas
   Warm the flour tortillas in a dry skillet over medium heat for about 30 seconds per side, or wrap them in foil and place in a 350°F oven for 10 minutes. Keep them covered until serving.
   Look for Tortillas are soft and pliable.
   Tip Warm tortillas are easier to fold and taste better.
8. 8Serve the Fajita Filling
   Spoon the steak mixture onto warm tortillas. Serve immediately, letting everyone build their own tacos or fajitas.
   Look for The filling is steaming and ready to eat.
   Tip Add extra pickled jalapeños or cheese at the table if desired.

The steak has been shredded and stirred back into the sauce, which clings to every piece. The filling is steaming and fragrant, with a creamy, glossy texture. Warm tortillas are ready on the side. The final dish looks like a hearty, saucy fajita filling, with tender strands of beef and a smooth, cheesy sauce. It’s ready to be spooned onto plates and devoured.

Common mistakes

One common mistake is stirring the ingredients before cooking, which can cause the dairy to separate and create a grainy sauce. Let the layers sit undisturbed. Another is cooking on high heat, which can make the steak tough instead of tender — low and slow is the way to go.

Also, avoid lifting the lid repeatedly to check on the food, as this releases heat and extends cooking time. Finally, don’t skip the rest period; it’s essential for juicy meat.

How to tell it’s done

The steak is done when it reaches an internal temperature of at least 145°F (63°C) and is fork-tender, meaning it shreds easily with little resistance. The sauce will be thick and bubbling, with the cheese fully melted and blended.

If the steak is still chewy, continue cooking in 30-minute increments until it reaches the desired tenderness. Always let the meat rest for at least 3 minutes before serving to allow the juices to redistribute.

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