Place olive oil in a skillet and heat it to medium-high.

Add the minced garlic and cook for approximately a minute, or until fragrant.

Using a spoon, break up the ground beef as it cooks until it turns brown in the skillet.

Stir in fajita seasoning and cook for an additional 2-3 minutes.

Push the beef mixture to one side of the skillet and add sliced onions and bell peppers to the empty side.

Cook the vegetables until they are tender-crisp, about 3-4 minutes, then mix them with the beef mixture.

Meanwhile, warm the flour tortillas in a separate skillet or in the microwave according to package instructions.

Spoon the beef and vegetable mixture onto the center of each tortilla.

Top with your favorite optional toppings such as shredded cheese, salsa, sour cream, or guacamole.

Roll up the tortillas and serve immediately, garnished with fresh cilantro if desired.