Slow-Cooker Oaxaca Queso Fajita Beef Barbacoa

This slow-cooker barbacoa is the ultimate set-it-and-forget-it dinner. Cubed beef chuck, colorful fajita peppers, red onions, and lime juice are piled into the slow cooker and topped with a generous layer of Oaxaca and Mexican four-cheese blend.

After hours of gentle cooking, the beef becomes melt-in-your-mouth tender, and the cheese forms a blistered, golden blanket over the whole dish. Serve it over Spanish rice or in tortillas for a meal that feels like a fiesta.

This recipe brings together the rich, savory flavors of Mexican barbacoa with the comforting appeal of a slow-cooker meal. The beef chuck cubes are seasoned simply with lime and paired with sweet bell peppers and red onions.

As it cooks low and slow, the beef becomes incredibly tender and the cheese melts into a creamy, slightly blistered topping. It's a hands-off dish that delivers big flavor with minimal effort, perfect for busy weeknights or casual gatherings.

Ingredients

Why this recipe works

The slow cooker does all the work here, allowing the beef chuck to break down slowly until it's fork-tender and easily shredded. The low, even heat ensures the meat stays moist and absorbs the flavors of the peppers, onions, and lime. This method is foolproof and requires no babysitting.

The combination of Oaxaca cheese and Mexican four-cheese blend creates a rich, creamy topping that melts beautifully and develops a slightly blistered, golden crust on top. The cheese not only adds flavor but also helps keep the beef and vegetables moist as they cook.

Notes and substitutions

Oaxaca cheese is a Mexican string cheese that melts exceptionally well, giving a stretchy, creamy texture. If you can't find it, mozzarella or Monterey Jack are good substitutes.

The Mexican four-cheese blend typically includes cheddar, Monterey Jack, Asadero, and Queso Quesadilla, adding depth to the dish.

For best results, use freshly shredded cheese rather than pre-shredded bags, which often contain anti-caking agents that can affect melting.

The beef chuck can be substituted with brisket or round roast, but adjust cooking time as needed. You can also add a pinch of salt and pepper to taste, though the video keeps it simple.

• Oaxaca cheese: Mozzarella or Monterey Jack cheese can be used instead, but the flavor will be milder.
• Mexican four-cheese blend: Any shredded melting cheese like cheddar or Colby Jack works, though the authentic flavor will change.
• Beef chuck: Beef brisket or round roast can replace chuck; adjust cooking time as needed.

Equipment

• Slow cooker (6-quart or larger)
• Cutting board
• Chef's knife
• Measuring spoons
• Serving spoon