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Swannys Killer Fajitas

Savory Beef Fajitas! Marinate beef in fajita seasoning, garlic powder, and chili powder, then cook with sautéed onions and peppers. Serve with warm tortillas and build your own!

Meet Swanny’s Killer Fajitas, a flavorful and fiesta-worthy dish that’s sure to become a staple in your household! With tender beef, sautéed onions and bell peppers, and a blend of spices, these fajitas are packed with flavor and fun, perfect for a quick dinner or a lively gathering with friends and family.

Ready Time

45 mins


10 servings


  • 1 1/2 pounds beef fajita-cut strips
  • 2 large onions, sliced
  • 4 large bell peppers (any color), sliced
  • 8 small flour tortillas
  • 1 packet of fajita seasoning
  • 1/4 cup vegetable oil
  • 2 tablespoons butter
  • 1 teaspoon garlic powder
  • 1 teaspoon chili powder
  • Salt and pepper, to taste
  • 8 cups shredded cheese (Monterey Jack or Cheddar work well)
  • Optional toppings: diced avocado, diced tomatoes, shredded lettuce, sour cream, salsa


Slice the beef into thin strips and season with fajita seasoning, garlic powder, chili powder, salt, and pepper. Let it marinate for at least 30 minutes.

In a large skillet, heat 2 tablespoons of vegetable oil over medium-high heat.

Remove the beef from the marinade, letting any excess liquid drip off. Add the beef to the skillet and cook for 3-4 minutes per side, or until cooked to your desired level of doneness.

Transfer the beef to a plate and cover with foil to keep warm.

In the same skillet, add the remaining 2 tablespoons of vegetable oil. Add the sliced onions and bell peppers and cook until they’re tender, about 5 minutes.

Add the butter to the skillet and stir until melted.

Warm the tortillas by wrapping them in a damp paper towel and microwaving for 20-30 seconds. Assemble the fajitas by slicing the beef into thin strips and adding them to the tortillas along with the sautéed onions and peppers.

Top with shredded cheese and any desired toppings.

Serve immediately and let everyone build their own fajitas!


For best results, use beef strips that are uniform in size so they cook evenly.

If using beef with a lot of fat, you may want to trim excess fat before slicing to ensure tender fajitas.

You can customize the marinade to your taste by adding other spices or herbs like cumin, paprika, or oregano.

To make prep easier, slice the onions and bell peppers at the same time and store them in separate containers until ready to use.

When working with the skillet, be careful not to overcrowd it, as this can lower the cooking temperature and prevent the beef and vegetables from cooking evenly.

To ensure the cheese melts beautifully, sprinkle it on top of the fajita fillings and place the tortillas under the broiler for a few seconds.

For a variation, offer different types of cheese, such as Pepper Jack or Queso Fresco, to give guests more options.

Consider setting up a toppings bar with the optional toppings to let everyone create their own perfect fajita.

Because these fajitas are best served immediately, consider cooking the beef and vegetables just before assembling the fajitas to ensure everything stays hot and fresh.

Nutrional Value

  • Calories: 533
  • Total Fat: 26g
  • Saturated Fat: 11g
  • Cholesterol: 60mg
  • Sodium: 450mg
  • Total Carbohydrates: 44g
  • Dietary Fiber: 4g
  • Sugars: 6g
  • Protein: 35g
Swannys Killer Fajitas
Swannys Killer Fajitas

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