Pepper Jack Sizzling Fajita Beef Barbacoa

This slow-cooker pepper jack sizzling fajita beef barbacoa is the ultimate dump-and-forget dinner. Cubed beef chuck, rainbow bell peppers, red onions, and a creamy, spicy queso sauce come together in the crockpot with almost no effort.

After hours of low, gentle heat, the beef becomes melt-in-your-mouth tender, and the peppers and onions soften into sweet, charred-style ribbons. The sauce is rich, peppery, and irresistibly stretchy. Serve it over Mexican rice or scoop it up with crispy tortilla chips for a meal that feels like a fiesta.

This recipe turns a handful of simple ingredients into a deeply satisfying, slow-cooked meal. The beef chuck cubes break down into shreds that soak up the creamy, spicy queso sauce, while the bell peppers and onions add color and a gentle sweetness. The best part?

Everything goes into the slow cooker in layers, and then the appliance does the work. No browning, no stirring, no fuss. After eight hours, the kitchen smells incredible, and dinner is ready to serve straight from the pot. It is the kind of meal that makes weeknights feel special without any extra effort.

Ingredients

Why this recipe works

Slow cooking is the key to transforming tough beef chuck into fork-tender barbacoa. The low, moist heat breaks down the connective tissue in the meat, turning it into rich, gelatinous goodness.

As the beef cooks, it releases its juices, which mingle with the queso and pepper jack to create a luscious, savory sauce. The long cooking time also allows the flavors of the peppers, onions, and lime to meld and deepen, resulting in a dish that tastes far more complex than its ingredient list suggests.

Layering the ingredients without stirring is a deliberate technique. The beef sits at the bottom, where it cooks in its own juices and the melting cheese, while the peppers and onions steam and soften on top.

This method keeps the vegetables from becoming mushy and lets them retain a bit of texture. The queso blanco and pepper jack melt into a creamy, cohesive sauce that clings to every shred of beef and every strip of pepper. The result is a dish with distinct textures and layers of flavor.

Notes and substitutions

Beef chuck cubes are ideal for this recipe because they have enough marbling to stay moist during the long cooking time. Look for cubes that are about 1 to 1 1/2 inches in size. If you cannot find pre-cut stew meat, cut a chuck roast into cubes yourself. The bell peppers should be a mix of red, yellow, and orange for the most vibrant presentation, but any color combination works. Red onions add a mild sharpness that mellows as they cook.

Queso blanco dip is a smooth, white cheese sauce that melts beautifully. It is available in jars or refrigerated tubs in most supermarkets. If you prefer a spicier sauce, use a hot pepper jack or add a few slices of jalapeño. The tortilla chips and Mexican rice are optional but recommended for serving; they provide a crunchy and starchy contrast to the creamy beef. Store-bought Mexican rice is fine, or use a homemade recipe.

• beef chuck cubes: beef stew meat or brisket, cut into 1-inch cubes
• queso blanco dip: store-bought white queso sauce or homemade queso
• pepper jack cheese: Monterey Jack with a pinch of cayenne or chipotle powder
• bell peppers: any color bell peppers; use 3 total

Equipment

• 6-quart slow cooker
• Cutting board
• Chef's knife
• Measuring cups and spoons
• Serving spoon
• Serving plates