Pre-heat the oven to 400ºF.
Trim the top third of the jalapeños lengthwise, leaving the stems intact. Reserve the tops. Using a demitasse spoon or other small tool, scoop out the seeds and the ribs from all the peppers, making 12 “boats.” Chop all of the trimmed pepper tops and reserve.
In a mixing bowl, combine the softened cream cheese, grated onion, garlic, salt, pepper, shredded cheeses, cilantro and cumin. Add in the finely chopped jalapeños to your taste – I usually use about half of the total amount, reserving remaining jalapeños for other recipes.
In a small dish, combine the panko with the Parmigiano Reggiano cheese. Fill your jalapeño boats, mounding the filling up a bit. Roll the filling in the panko.
Arrange the poppers on a baking dish, spray lightly with cooking spray and bake until the breadcrumbs are evenly brown and the filling is bubbly, about 18-20 minutes.
Let stand for 10 minutes and serve.