01 -
Heat olive oil in a large skillet over medium-high heat. Add chopped onion and minced garlic; cook until softened and translucent.
02 -
Add ground beef to the skillet, breaking it apart with a spoon. Cook until evenly browned and no longer pink.
03 -
Stir in the chopped mushrooms, salt, black pepper, and paprika. Cook for 5 minutes, or until mushrooms are tender and release their juices.
04 -
Reduce heat to low. Stir in shredded mozzarella until melted and thoroughly combined with the beef-mushroom mixture.
05 -
Warm pita breads briefly in a toaster or oven, if desired. Carefully split open each pita to form pockets.
06 -
Spoon cheesy beef and mushroom filling evenly into the warmed pita pockets.
07 -
Generously drizzle Tzatziki sauce over the filled pitas. Garnish with chopped fresh parsley if desired. Serve immediately while warm.