Mix together the brine ingredients in a medium size container and stir to dissolve the salt. Add the pork chops, and if necessary, weight them down to keep them completely submerged for 1 hour.
Preheat the broiler.
Roast the tomatillos, garlic and chiles on a baking sheet 4 inches below a very hot broiler until darkly roasted, even blackened in spots, about 5 minutes. Flip them over and roast the other side—4 or 5 minutes more will give you splotchy-black and blistered tomatillos. You'll need to remove the garlic and chiles sooner than the tomatillos.
Cool and transfer everything to a food processor or blender, being careful to scrape up all the delicious juice that has run out onto the baking sheet. Add the cilantro and 1 teaspoon salt. Process until smooth. Pour in the heavy cream and pulse to incorporate. Taste and adjust seasonings if necessary. Transfer the sauce to a small saucepan.
Reduce the heat to 375 degrees.
Heat a very large (14-inch) skillet over medium-high heat. Once hot, add 2 tablespoons olive oil. Scoop in the apple slices and saute for 2 minutes, gently stirring so as not to break up the apples. Add the garlic and serranos, stirring for about 30 seconds until you can smell the garlic aroma. Scoop in the mushroom slices and continue to saute for about 7 to 8 minutes or until the apples and mushrooms begin to brown and have softened. Transfer to a large bowl and fold in 1/2 cup of the tomatillo sauce.
Remove the pork chops from the brine and pat dry. Cut a large, deep slit in the side of each of the chops. The bigger the hole, the more stuffing you'll be able to fit in. Stuff each of the chops with apple/mushroom mixture. Salt and pepper both sides of the chops. Add any leftover stuffing to the tomatillo sauce.
Return the skillet to the stovetop over medium-high heat, and add 1 1/2 tablespoons olive oil. Once the pan is hot, add the stuffed pork chops. Brown on both sides, about 3 minutes per side. Transfer them to a wire rack, set over a rimmed baking sheet and place in the preheated oven. Roast for about 20 minutes or until pork is medium-rare. Remove from the oven and let rest, covered for 5 minutes. In the meantime, gently rewarm the tomatillo sauce.
Ladle the warmed sauce onto a plate, place the stuffed pork chop on top, and garnish with cilantro.