Cook pancetta in dutch oven over med heat until crispy; six to eight mins. Using slotted spoon, transfer to paper towel-lined plate; set aside
Add 1 tablespoon oil,garlic, an pepper flakes to now-empty pot an cook until fragrant, about 30 seconds. add brocclini an cook, stirring frequantly, until bright green, about 5 min. add 3/4 cup water, cover, an cook till broclini is tender, about 5 min.
Remove lid an continue cooking until liquid has evaporated. about 1 min. Remove from heat an stir in pancetta, vinegar, an remaining 1/2 tablespoon oil. season with salt an pepper to taste. transfer to platter an sprinkle with parmesan. serve