BRING onions, water and salt to boil in medium saucepan on medium heat; simmer on low heat 30 min. or until onions are tender, stirring occasionally. Drain.
MEANWHILE, cook bacon in skillet on medium heat until crisp, stirring frequently; drain.
WHEN ready to serve,
FOR each serving: Grill 1 pita on medium-high heat 1 min. on each side or just until grill-marked on both sides. Spread with 1/4 cup cream cheese; top with 1 cup onions, 1/2 cup bacon and 1 tsp. thyme.
PLACE in half-sheet pan. Bake in 375ºF convection oven 2 to 3 min. or until heated through. Cut into 4 pieces.