Place bacon in a 12-inch skillet; bake until crisp, about 20 minutes. Remove bacon and let drain on paper towels, reserving drippings in skillet.
Add Brussels sprouts, salt, and ¼ teaspoon pepper to skillet, stirring until well combined.
Bake, stirring halfway through baking, until Brussels sprouts are crisp-tender, 10 to 12 minutes.
In a small bowl, stir together pepper jelly, mustard, and remaining ¼ teaspoon pepper. Add pepper jelly mixture to Brussels sprouts, stirring until well combined.
Bake until Brussels sprouts are tender, about 5 minutes more. Chop bacon and sprinkle over sprouts. Garnish with green onion, if desired. Serve immediately.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/pepper-jelly-brussels-sprouts/