In a large nonreactive dish, combine orange zest, both juices, garlic, dry mustard, 1/4 teaspoon salt, ginger, and nutmeg. Add chicken; cover, and refrigerate 1 hour.
Preheat oven to 400 degrees. In a food processor, pulse breadcrumbs, butter, remaining 1/4 teaspoon salt, and pepper until fine crumbs. Transfer to a shallow bowl. Remove chicken from marinade, letting excess drip off; dredge in breadcrumb coating. Place on a lightly oiled baking sheet; bake until crisp and brown, 12 to 14 minutes.
Meanwhile, strain marinade into a small saucepan. Measure out 2 tablespoons; mix with cornstarch in a small bowl. Bring marinade in pan to a boil. Drizzle in cornstarch mixture, whisking constantly; boil, stirring, 1 minute more. Let cool slightly; stir in honey. Serve with chicken fingers.