Spread some sauce on your flatbread, and/or drizzle it on top after baking
Top with shredded chicken, cheeses, bacon, chopped apples, sliced onions, etc.
Place topped flatbread into a pre-heated 400-degree oven for 5 - 10 minutes, just long enough to warm everything up, melt the cheeses, and crisp the edges.
If you wish, Top with fresh arugula or other greens after baking.
Add more sauce just before serving, if you like.