In a large nonstick skillet over medium-high heat, cook the beef for 7 minutes, or until no longer pink, stirring occasionally.
Add garlic powder, chili sauce or ketchup, barbecue sauce, and brown sugar, stirring well to mix.
Cover the skillet, reduce heat to low, and simmer for 10 to 15 minutes.
When ready to serve, stack the pita breads on a microwave-safe plate, and warm them in a microwave oven for 30 seconds on high.
Cut pita breads in half and carefully open them at cut side. Fill each with ⅛ of sloppy joe mixture.