Preheat oven to 400*
Brown ground beef in skillet till no pink remains. Stir in picante sauce and adobo. Cook on low 5 minutes. Set aside.
Cut cheese slices in 4 triangles each.
Using cheese triangle as a stencil, cut flatbread into triangles with a pizza cutter or knife.
On a sheet pan covered with aluminum foil, place 1 flatbread, 1 cheese triangle and 1 spoonful of meat mixture . Top with another cheese triangle. Bake in oven till browned and melted. 5-7 minutes
Sprinkle with minced jalapeño and diced avocado, if desired.