1. Preheat oven to 350 degrees. Toast bread cubes on a baking sheet until golden, about 7 minutes. Heat butter and 1 tablespoon oil in a 12-inch ovenproof skillet over medium heat. Cook onion, stirring, until soft, about 3 minutes. Add celery; cook 1 minute. Transfer to a bowl. Reserve skillet. Toss bread, herbs, 1/4 teaspoon coriander, and 3 tablespoons stock with onion mixture. Season with salt and pepper.

2. Stuff chops. Using a fork, mix and mash garlic, 2 teaspoons coriander, 1/2 teaspoon salt, and 1 tablespoon oil; rub onto pork. Heat 2 tablespoons oil in skillet over medium-high heat. Cook pork until golden brown, 2 to 3 minutes; flip, and transfer skillet to oven. Cook until pork registers 155 degrees, about 15 minutes. Transfer to a plate; cover.

3. Add sherry and 1/2 cup stock to skillet. Cook over medium-high heat, stirring, until reduced by half. Serve with pork.