After removing the tops and seeds of the jalapenos, wrap the cheese pieces with a piece of prosciutto. (Make sure to portion out the prosciutto so that there is enough for all the poppers.) After each piece of cheese is wrapped with a piece of prosciutto, stuff it inside the jalapeno as far as it will go. Repeat this process with all the poppers.
Prepare a grill for medium direct heat (about 350 degrees). Grill the poppers for about 8 minutes total, 4 minutes each side, or until nice char marks form and the cheese begins to melt.
Pull off the grill and serve! These will be the hit of the party, guaranteed!