In a medium mixing bowl mix the ground beef, cilantro, salt, and pepper. Form 2 round patties, place on a hot grill, griddle, or pan. Grill for 3-4 minutes on each side, remove from heat.
In a small mixing bowl mix the avocado, mango, tomatoes, onions, cilantro, salt, pepper, olive oil. Set Aside.
In a small sauce pan combine the cheese, milk, salt, pepper, paprika and cornstarch. Bring to a boil while whisking.don't worry if there are any clumps they will smooth out as you whisk. Whisk for 1-2 minutes. remove from heat.
Place the burger on the buns, pour 1/2 the avocado mixture on each burger, pour half the cheese sauce on each burger.