Step 1

In a large skillet over medium-high heat, heat oil until hot; cook peppers and onion 8 to 10 minutes, or until vegetables are tender. Transfer to a bowl and set aside.

Step 2

Add beef to skillet and sprinkle with salt and pepper; saute 2 to 3 minutes, or until no pink remains in the beef.

Step 3

Place beef in pita pockets, top with vegetables, and drizzle with melted cheese. Serve immediately.