This Flatbread Pizza Recipe is made with sweet caramelized onions, salty, smoky crumbles of bacon, tart apples, crumbled blue cheese and a drizzle of honey. Caramelized onion flatbread pizza is perfect for parties, game days, or pizza night. Super easy to make and packed full of amazing sweet and savory flavors, this easy flatbread pizza is a MUST MAKE!