Cut a long slit in each pepper and dig out the seeds and white membranes.
3.
Stir cream cheese, Monterey Jack cheese, garlic powder, cumin, chili powder, salt, and smoked paprika together in a bowl. Spoon 1 tablespoon cream cheese mixture into each jalapeno pepper.
4.
Loosely wrap peppers in foil, keeping them in one layer. Place on grill and cook for about 8 minutes with the grill lid closed, until the peppers are soft and the stuffing is gooey. Serve.